Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, truong thanh
tieu sang » chieu sang, tieu dung, tiem nang
hanh dang » anh dang, hanh dung, hanh mang
hanh dong » anh dong, ha dong
van nhung » van nhuong, va nhung, van hung
cong tan » cong tac, cong san, cong ty
tran cau » tran chau, toan cau, ran cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sang - ((hanh dang) OR (hanh dong)) van nhung ((cong tan) or (cong thanh)) tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sang - ((hanh dang) OR (hanh dong)) van nhung ((cong tan) OR (cong thanh)) tran cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sang - ((hanh dang) OR (hanh dong)) van nhung ((cong tan) or (cong thanh)) tran cau".
• Adding a wildcard symbol may retrieve word variants: theo tieu sang - ((hanh dang) OR (hanh dong)) van nhung ((cong tan) or (cong thanh)) tran cau*.