Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung cua » truong cua, trung tuan, trung cap
hang cong » dang cong, hang nong, bang cong
doc hieu » toc thieu, hoc thieu, hoc hien
hieu luc » hieu luat, hieu qua
cua hang » cua dang, cua nhung, cua cong
dan toan » van toan, dan than, manh toan
van quan » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu luc - thanh trung cua hang cong ((dan toan) or (van quan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu luc - thanh trung cua hang cong ((dan toan) OR (van quan)) cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu luc - thanh trung cua hang cong ((dan toan) or (van quan)) cau*.