Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
doi chieu » doc hieu, doi chi, ho chieu
dung cong » dung trong
tran van » luan van
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu xanh - hanh ((tran van) or ((luan OR quan) van)) dung cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu xanh - hanh ((tran van) OR ((luan OR quan) van)) dung cong tac toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu xanh - hanh ((tran van) or ((luan OR quan) van)) dung cong tac toan cao".
• Adding a wildcard symbol may retrieve word variants: doi chieu xanh - hanh ((tran van) or ((luan OR quan) van)) dung cong tac toan cao*.