Perhaps you should try some spelling variations:
tieu sang » chieu sang, tieu dung, tiem nang
dung cong » dung trong
mang van » dang van, tang van, mang va
lang van » dang van, tang van, hoang van
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sang - hanh ((mang van) or (lang van)) dung cong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sang - hanh ((mang van) OR (lang van)) dung cong dan than cao*.