Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung va » truong va, trang va, trung ha
cong tan » cong tac, cong san, cong thanh
toan ban » van 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: hoc ((hieu manh) OR (chieu sach)) - thanh trung va nhung cong tan ((toan tap) OR (toan ban))~.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (chieu sach)) - thanh trung va nhung cong tan ((toan tap) or (toan ban))*.