Perhaps you should try some spelling variations:
luan hang » luan nang, luan han, luan tang
luan hung » luan chung, lan hung, luan ung
theo yeu » theo tieu, thiet yeu, theo chu
yeu tinh » yeu tin, lieu tinh, kieu tinh
anh tang » anh bang, anh dang, anh nang
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo yeu tinh - anh tang ((luan hang) or (luan hung)) cong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo yeu tinh - anh tang ((luan hang) OR (luan hung)) cong tan toan cao.
• Adding a wildcard symbol may retrieve word variants: theo yeu tinh - anh tang ((luan hang) or (luan hung)) cong tan toan cao*.