Perhaps you should try some spelling variations:
thanh trung » thanh tung
thanh huong » thanh cong, anh huong, thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
thanh hung » thanh tung, thanh cong, manh hung
hieu lang » chieu sang, hieu quang, nhieu tang
cong tan » cong tac, cong san, cong thanh
tran cao » toan cao, tran chau, trang cho

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) or (chieu sach)) - thanh trung ((thanh hung) or (thanh huong)) cong tan tran cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (chieu sach)) - thanh trung ((thanh hung) OR (thanh huong)) cong tan tran cao.
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) or (chieu sach)) - thanh trung ((thanh hung) or (thanh huong)) cong tan tran cao*.