Perhaps you should try some spelling variations:
trung truyen » trang truyen, tang truyen, trinh truyen
trung tuyen » trang tuyen, trung huyen, trung nguyen
duong cong » dung cong, luong cong, duong trong
hieu lang » chieu sang, hieu quang, nhieu tang
cong tac » cong ty
tran cau » tran chau, toan cau, tra cau
ho hieu » ho chieu, hoi hieu, nho hieu
ran cau » van cau, ban cau, can cau

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 (trung truyen)) duong cong tac ((tran cau) OR (ran cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh ((trung tuyen) OR (trung truyen)) duong cong tac ((tran cau) OR (ran cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh ((trung tuyen) or (trung truyen)) duong cong tac ((tran cau) OR (ran cau))".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh ((trung tuyen) or (trung truyen)) duong cong tac ((tran cau) OR (ran cau))*.