Perhaps you should try some spelling variations:
truong thanh » truong trung, truong thpt, truong chung
doi chieu » doc hieu, ho chieu, mot chieu
tung cong » dung cong, tong cong, truong cong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan ban » van ban
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: ((doi chieu) OR (doi chi)) xanh - thanh ((trung thanh) or (truong thanh)) tung cong tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) xanh - thanh ((trung thanh) OR (truong thanh)) tung cong tac toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doi chi)) xanh - thanh ((trung thanh) or (truong thanh)) tung cong tac toan ban".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doi chi)) xanh - thanh ((trung thanh) or (truong thanh)) tung cong tac toan ban*.