Perhaps you should try some spelling variations:
quan nhung » qua nhung, cua nhung, luan chung
thanh dung » thanh duong, thanh tung, thanh hung
hieu cach » chieu sach, hieu ca, biet cach
dung quan » dung quang, dung luan, luong quan
hieu cac » hieu luc, hieu va, hieu van
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
than cau » toan cau, phan cau, than cap

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 cach) or (hieu cac)) - thanh dung quan nhung ((cong dan) OR (cong san)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu cach) OR (hieu cac)) - thanh dung quan nhung ((cong dan) OR (cong san)) than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu cach) or (hieu cac)) - thanh dung quan nhung ((cong dan) OR (cong san)) than cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu cach) or (hieu cac)) - thanh dung quan nhung ((cong dan) OR (cong san)) than cau*.