Perhaps you should try some spelling variations:
chiet tach » chieu sach
thanh tung » thanh cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
va trong » va truong, va thong, va tuong
cong ban » cong bang, cong san, cong tan
chan cap » than cap, cao cap, phan cac
khan cap » khan ap, than cap, khoan cam
tung va » trung va, tuong va, dung va

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 ((hieu manh) OR (chiet tach)) - thanh tung va trong cong ban ((chan cap) OR (khan cap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu manh) or (chiet tach)) - thanh tung va trong cong ban ((chan cap) OR (khan cap))~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (chiet tach)) - thanh tung va trong cong ban ((chan cap) OR (khan cap))*.