Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
hieu cac » hieu luc, hieu va, hieu van
tung cua » trung cua, tuong cua, dung cua
dong san » dong bang, dong von, dong ha
cong san » cong tac
khan cap » khan ap, than cap, khoan cam

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: doc ((hieu cac) OR (chieu sach)) - thanh tung cua cong ((dong san) OR (cong san)) khan cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu cac) or (chieu sach)) - thanh tung cua cong ((dong san) OR (cong san)) khan cap~".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu cac) or (chieu sach)) - thanh tung cua cong ((dong san) OR (cong san)) khan cap*.