Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu cach » hieu cac, chieu sach, hieu ca
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
hoc hieu » hoc thieu, hoc hien, doc hieu
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
phan van » pham van, thanh van, luan van
hang dau » hang va, hang tai

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 trung cua thong ((cong dan) OR (cong san)) ((phan van) OR (hang dau))~.
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - thanh trung cua thong ((cong dan) or (cong san)) ((phan van) or (hang dau))*.