Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
san khang » van khang, san chang, tan khang
san khong » sao khong, hang khong, nhan khong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van 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) or (chieu sach)) - thanh cong ((san khang) OR (san khong)) cong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu xanh) OR (chieu sach)) - thanh cong ((san khang) OR (san khong)) cong tan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu xanh) or (chieu sach)) - thanh cong ((san khang) OR (san khong)) cong tan toan cao".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu xanh) or (chieu sach)) - thanh cong ((san khang) OR (san khong)) cong tan toan cao*.