Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
hieu cach » hieu cac, chieu sach, hieu ca
dang cong » dung cong
dan thanh » dang thanh, danh thanh, ban thanh
thanh cac » hanh cac, thanh bac, thanh ca
hoc hieu » hoc thieu, hoc hien, doc hieu
dung cua » dung luan
cong dan » cong san, cong tan, huong dan

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: hoc hieu cach - thanh ((((dung cua) OR (dung cho))) OR (trung tuan)) dang cong dan thanh cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu cach - thanh ((((dung cua) OR (dung cho))) or (trung tuan)) dang cong dan thanh cac~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - thanh ((((dung cua) OR (dung cho))) or (trung tuan)) dang cong dan thanh cac*.