Friends and Allies Vietnam is very short on friends at the moment. For about the past eighty years she was being forced to serve in France's house, and not even as a servant but a servant of one of his servants. Having been in that position, she's running rather low on connections with others in general, except perhaps with a few other nations who were also under French rule.
Even then she's a bit of an isolationist and tends to prefer to remain more of a positive acquaintance of someone rather than becoming their friend. Which isn't to say that she outright refuses friendship, but she tends to approach such things cautiously. She's been stabbed in the back so many times by people she should have been able to trust that she's pretty much gotten used to that, so she almost views new friendships with the lens of welcoming yet another person into her life that will probably also hurt her later. Even so she'll occasionally find someone whose friendship seems worth their likely eventual betrayal, and when she has such a friend she is fiercely loyal.
She's also loyal to her allies, as long as they're decent, stable allies. She doesn't really have any of them at the moment, though she's looking for them. In fact, she's willing to do literally anything if it results in her freedom, so she's willing to entertain the idea of allying with pretty much anyone as long as she thinks that they'll actually be a good ally. Even with her enemies - she's not picky when she's being goal-oriented.
Enemies On the surface, Vietnam doesn't seem to have much in the way of enemies. After all, she's all smiles and kind words toward almost everyone, except perhaps France. And that's only understandable - nobody really appreciates being colonized. But the truth of the matter is that the only reason why she's openly angry with France is because she has very little reason not to be - it would be strange if she wasn't at least upset with him and he's not presently in a situation where it would help her if she catered to his feelings. And she absolutely loathes him so she's not going to pretend to be nice just for the fun of it.
However, she does pretend to be nice literally all the time. With Japan and China especially, as she does have something to gain from being nice. And China especially she has very mixed feelings about - he raised her and she doesn't even believe that he did a bad job. While she certainly isn't Chinese, she's not that different either, as she didn't feel the need to stray very far. She did, however, feel the need to be independent, and the fact that she's had to fight for that from him several times means that even though they frequently get along very well lately she also takes pleasure in seeing him in pain. She's not likely to cause him pain unless he does something further to her, but she will enjoy it if it happens.
By contrast, her current anger at Japan is almost nothing personal. He's never really had any conflict with her before, but he's a big empire now and didn't let her have her freedom. And she understands that, but she's willing to fight for her freedom without holding anything back. That's just the way it is.
Also on her list of enemies are all nations in the Indochinese peninsula. But that's entirely her own fault - she believes that the whole of it rightfully belongs to her. And while she wouldn't consider Europeans to be her enemies, she certainly has a bias against them - she's not met very many, and her experiences with them haven't been very good on the whole, so they can expect her to be a bit wary of them until she gets to know them properly.
But other than that, she doesn't really have any enemies. She holds no animosity toward the other empires or their various protectorates and such. After all, on the whole the last war actually worked out to her benefit, so she has no real reason to be upset at anyone for being involved.
Lovers Yet another category of people who she assumes will stab her in the back at some point, but again she sometimes decides that it's worth it anyway. As an extremely volatile woman, she's been known to get carried away in the heat of the moment sometimes. But it's not that she can't control herself - she has a lot of self-discipline, actually - it's that she's inclined to decide that something is 'worth it' or ask herself 'why not?' when she sees something that she wants. As such, she has a track record of making decisions in matters of love (or, more accurately, lust) that others would decry as impulsive and ill-advised.
However, she doesn't mistake allowing herself to get carried away in the heat of the moment for an actual relationship. No, it's just a moment to forget her troubles. When it comes to actual relationships, she's even more wary of those than she is of friendships. Which doesn't mean that it's impossible to steal her heart, it's that she guards it carefully and doesn't give it to just anyone who has kind things to say about her appearance and personality. No, it has to be earned and won - but it's definitely worth it if you can get it. Her love and loyalty are absolute for those who manage to get it.