Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
nhung cong » dung cong, thong cong, hang cong
truong va » truong dai, truong cao, truong dao
trung va » trang va, trung ha, trung tam
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sach) OR (chieu sang)) - thanh ((trung va) or (truong va)) nhung cong tac than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (chieu sang)) - thanh ((trung va) OR (truong va)) nhung cong tac than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) OR (chieu sang)) - thanh ((trung va) or (truong va)) nhung cong tac than cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) OR (chieu sang)) - thanh ((trung va) or (truong va)) nhung cong tac than cau*.