Perhaps you should try some spelling variations:
trung tuyen » trung truyen, trang tuyen, trung huyen
tang truyen » cong truyen, tvqg truyen, tap truyen
duong cong » dung cong, luong cong, duong trong
hieu lang » chieu sang, hieu quang, nhieu tang
cong tac » cong ty
tac tran » tan tran, tac trai, tac tren
tran cau » tran chau, toan cau, ran cau
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - hanh ((trung tuyen) or (tang truyen)) duong cong tac tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh ((trung tuyen) OR (tang truyen)) duong cong tac tran cau.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh ((trung tuyen) or (tang truyen)) duong cong tac tran cau*.