Perhaps you should try some spelling variations:
chan dung » van dung, dan dung
thi oanh » thi hanh, thi thanh, thi nang
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
thi anh » thi hanh, thi thanh, thich anh
han ung » phan ung, han tong

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((thi oanh) or (thi anh)) - canh tranh ((han ung) or (chan dung)) cong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((thi oanh) OR (thi anh)) - canh tranh ((han ung) OR (chan dung)) cong tan toan cao.
• Adding a wildcard symbol may retrieve word variants: doi ((thi oanh) or (thi anh)) - canh tranh ((han ung) or (chan dung)) cong tan toan cao*.