Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
theo hieu » theo chieu, thien hieu, thuc hieu
hanh tang » hanh trang, anh tang, hanh mang
van nhung » van nhuong, va nhung, van hung
tang van » dang van, hoang van, trong van
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » 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 hieu) or (theo tieu)) lang - hanh tang van nhung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo hieu) OR (theo tieu)) lang - hanh tang van nhung cong tac toan cau*.