Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, truong thanh
theo chieu » theo tieu, ho chieu, theo chu
hanh dong » anh dong, ha dong
doc hieu » toc thieu, hoc thieu, hoc hien
dong cua » dung cua, cong cua, huong cua
cua tong » cua cong, cua dong, cua nong
cong tan » cong tac, cong san, cong ty
than cao » toan cao, thai cao, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (doc hieu)) tinh - hanh dong cua tong ((cong tan) OR (cong thanh)) than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (doc hieu)) tinh - hanh dong cua tong ((cong tan) OR (cong thanh)) than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (doc hieu)) tinh - hanh dong cua tong ((cong tan) OR (cong thanh)) than cao".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (doc hieu)) tinh - hanh dong cua tong ((cong tan) OR (cong thanh)) than cao*.