Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
hang hang » nang hang, cang thang, hung thang
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
than cao » toan cao, than cap, than sao
thai cao » tai cao, thoai cac, thuat cao
va dung » van dung, va duong, vat dung

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)) - hang hang va dung cong tan ((than cao) or (thai cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (hieu lang)) - hang hang va dung cong tan ((than cao) OR (thai cao)).
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (hieu lang)) - hang hang va dung cong tan ((than cao) or (thai cao))*.