Perhaps you should try some spelling variations:
trang truyen » tang truyen, trang tuyen, trung truyen
trung tuyen » trung truyen, trang tuyen, trung huyen
hieu quang » thieu quang, hieu quan, hieu qua
duong cong » dung cong, luong cong, duong trong
hoi hieu » hoi phieu, hoi tieu, moi hieu
cong tac » cong ty
tac ran » tac can, tac van, tac quan
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: hoi hieu quang - hanh ((trung tuyen) or (trang truyen)) duong cong tac ran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu quang - hanh ((trung tuyen) OR (trang truyen)) duong cong tac ran cau.
• Adding a wildcard symbol may retrieve word variants: hoi hieu quang - hanh ((trung tuyen) or (trang truyen)) duong cong tac ran cau*.