Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chieu tinh » trieu tinh, lieu tinh, chau tinh
dang cong » dung cong
cong tac » cong ty
lua dang » cua dang, lua sang, luan nang
cong tan » cong san, cong thanh, cong ty
tac lua » tac cua, tac quan, cac luat
tan dat » dan dat, ban dat, tan dac
dat may » dam may

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) or (chieu tinh)) - cong tac lua dang cong tan dat may~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chieu tinh)) - cong tac lua dang cong tan dat may*.