Perhaps you should try some spelling variations:
dang cong » dung cong
chu manh » ho manh, chu han, chu van
tang van » dang van, hoang van, trong van
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cao » toan cao, thai cao, than cap
tang va » trang va, thang va, tang vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chuc nang) or (chu manh)) - hanh ((tang va) or (tang van)) dang cong tan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chuc nang) OR (chu manh)) - hanh ((tang va) OR (tang van)) dang cong tan than cao.
• Adding a wildcard symbol may retrieve word variants: theo ((chuc nang) or (chu manh)) - hanh ((tang va) or (tang van)) dang cong tan than cao*.