Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh nung » thanh tung, thanh hung, thanh dung
doi chieu » doc hieu, doi chi, ho chieu
dung cong » dung trong
nung cao » nang cao, nhung cau, quang cao
cao dung » cao dang, cao dong, cao ung
cong san » cong tac
phan cau » phan dau, phan cac, phan tu
khan cap » khan ap, than cap, khoan cam

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 - thanh nung cao dung cong san ((phan cau) or (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - thanh nung cao dung cong san ((phan cau) OR (khan cap)).
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh nung cao dung cong san ((phan cau) or (khan cap))*.