Perhaps you should try some spelling variations:
thanh tran » thanh trang, thanh toan, thanh tra
hieu lang » chieu sang, hieu quang, nhieu tang
tran van » luan van
van dang » van dong, van dung, van nang
cong dan » cong san, cong tan, cong dong
than tap » toan tap, han tap, phan tap
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 - thanh tran van dang ((cong dan) or (huong dan)) than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh tran van dang ((cong dan) OR (huong dan)) than tap.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh tran van dang ((cong dan) or (huong dan)) than tap*.