Perhaps you should try some spelling variations:
tieu sang » chieu sang, tieu dung, tiem nang
nang cong » nang song, dang cong, bang cong
trang va » hang va
tran van » luan van
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man

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 ((trang va) or (tran van)) nang cong dan than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sang - hanh ((trang va) OR (tran van)) nang cong dan than ban.
• Adding a wildcard symbol may retrieve word variants: theo tieu sang - hanh ((trang va) or (tran van)) nang cong dan than ban*.