Perhaps you should try some spelling variations:
trinh luan » trinh luat, trinh han, trinh toan
trinh quan » tinh quang, trinh luat, trinh han
dang cong » dung cong
theo yeu » theo tieu, thiet yeu, theo chu
yeu tinh » yeu tin, lieu tinh, kieu tinh
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: theo yeu tinh - hanh ((trinh luan) OR (trinh quan)) dang cong dan toan cao~.
• Adding a wildcard symbol may retrieve word variants: theo yeu tinh - hanh ((trinh luan) or (trinh quan)) dang cong dan toan cao*.