Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu xanh » chieu sach, chieu sang, hieu manh
chieu tinh » trieu tinh, lieu tinh, chau tinh
tac dung » sach dung, tin dung, van dung
cong tac » cong ty
tac trai » tam trai, khac trai, rac thai
trai tap » bai tap, toan tap, tri tai

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 tinh)) - thanh trung ((tac dung) OR (xay dung)) cong tac trai tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu xanh) OR (chieu tinh)) - thanh trung ((tac dung) OR (xay dung)) cong tac trai tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu xanh) or (chieu tinh)) - thanh trung ((tac dung) OR (xay dung)) cong tac trai tap".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (chieu tinh)) - thanh trung ((tac dung) OR (xay dung)) cong tac trai tap*.