Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
mot chieu » doi chieu, ho chieu
nang luan » hang luan, nang quan, bang luan
tang luan » dung luan
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((mot chieu) or (doi chi)) xanh - anh ((nang luan) or (tang luan)) nhung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((mot chieu) OR (doi chi)) xanh - anh ((nang luan) OR (tang luan)) nhung cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ((mot chieu) or (doi chi)) xanh - anh ((nang luan) or (tang luan)) nhung cong tac toan cau*.