Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
doanh cua » doanh luan
chu sang » thu sang, chieu sang, chuc nang
chu bang » thu bang, chuc nang, chu quang
manh cua » ban cua
cong san » cong tac
san van » tan van, luan van, tran van

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

• Performing a fuzzy search may retrieve terms with similar spellings: chao ((chu sang) or (chu bang)) - hanh ((manh cua) or (doanh cua)) nhung cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: chao ((chu sang) OR (chu bang)) - hanh ((manh cua) OR (doanh cua)) nhung cong san van ban.
• Adding a wildcard symbol may retrieve word variants: chao ((chu sang) or (chu bang)) - hanh ((manh cua) or (doanh cua)) nhung cong san van ban*.