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
khoan cam » khoa cam, khoan va, phan cam
nung cao » nang cao, nhung cau, quang cao
cao dung » cao dang, cao dong, cao ung
cong tan » cong tac, cong san, cong thanh
phan dau » phan tu, hang dau

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