Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doc chieu » doc hieu, doi chieu, toc thieu
cong cong » cong dong, trong cong, dung cong
cong hang » cong thang, cong hung, cong lang
thong tu » phong tuc, thong tin, thong ke
hang ca » nang cao, hang tai, hang dau
va ca » va cac, va cao, va cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc chieu sach - hanh ((thong tu) or (hang ca)) cong cong hang va ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc chieu sach - hanh ((thong tu) OR (hang ca)) cong cong hang va ca*.