When you talk to her, speak with respect. You should never rudely criticize her or say things which are demeaning. Just like it wouldn't be acceptable for someone to say these things to you, it's not acceptable for you to say those things to her. Try to think not only about how you'd feel if someone said something to you but also think about how her own experiences might lead her to feel about what you said. For example, only call her a girl if she is one. Is your girl older than, say, 20 years old? At that point you should be calling her a woman or a lady. When you call her girl, you're making her seem like a child, implying that she can't do things for herself, think, or act like the capable adult she is. Get to really know her for who she really is, not just what you think she is or want her to be. Ask questions about her. Dig deep. Take an interest in what she says, what she does, and what she wants. She'll notice that you do these things and it will show her that not only do you care about her but that you also respect who she is as a person.  Ask questions about her religion, her political views, what it was like for her growing up, what she wants for the future. You can also ask the usual questions like her favorite color or food, but these kinds of things need to be balanced out with a deeper understanding of who she is. Listen to what she says. When she talks, you should be listening. Don't tune her out because she "talks too much". Pay attention because you might learn things about her that you didn't know before. Instead of fighting and insulting each other when you have a fight, talk things out. If you really want to treat both her and yourself right, talk about things that bother you when they happen or very soon afterward. Bottling things up and "keeping score" will just make both of you miserable. You also shouldn't talk behind her back. A lot of the time it's easier to complain about your girlfriend to everyone except for your girlfriend but this isn't fair to her and it isn't helpful for you....

How would you rephrase that briefly using Vietnamese?
Nói chuyện với sự tôn trọng. Thấu hiểu cô ấy. Hãy thảo luận khi bạn đang gặp phải vấn đề nào đó. Khen ngợi cô ấy đúng cách. Để ý đến những gì mình nói. Nhìn chung hãy luôn thành thật nhưng nếu bắt buộc thì nên nói dối một cách thông minh.