Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
truong dao » truong dai, truong cao, truong bo
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
truong va » truong dai, truong cao, luong va
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap

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 (hieu lang)) - thanh ((truong va) OR (truong dao)) nhung cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (hieu lang)) - thanh ((truong va) OR (truong dao)) nhung cong san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) or (hieu lang)) - thanh ((truong va) OR (truong dao)) nhung cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (hieu lang)) - thanh ((truong va) OR (truong dao)) nhung cong san toan cau*.