Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
dung cong » dung trong
hang tai » hang va, dung tai
cong tac » cong ty
tac tai » tac trai, tac thi, bac tai
tai cao » thai cao, tao cao, tai sao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu xanh) OR (chieu sach)) - hanh ((nang cao) or (hang tai)) dung cong tac tai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu xanh) OR (chieu sach)) - hanh ((nang cao) OR (hang tai)) dung cong tac tai cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu xanh) OR (chieu sach)) - hanh ((nang cao) or (hang tai)) dung cong tac tai cao*".