Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
cuong tap » cong tac, luong tai, cong tan
luong tap » luong tai, luong tham, luong thai
cua dung » cua dang, cua dong, qua dung
toan tap » toan ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chinh sach) OR (hieu lang)) - thanh trung cua dung ((cuong tap) OR (luong tap)) toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chinh sach) or (hieu lang)) - thanh trung cua dung ((cuong tap) OR (luong tap)) toan tap~".
• Adding a wildcard symbol may retrieve word variants: ho ((chinh sach) or (hieu lang)) - thanh trung cua dung ((cuong tap) OR (luong tap)) toan tap*.