Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trong » hanh trang, hinh trong, chinh trong
doi chieu » doc hieu, doi chi, mot chieu
anh trong » anh thuong, dinh trong, lang trong
dung cong » dung trong
cong sang » cong san, cong lang, cong vang
sang khan » sang than, dang khanh, sang a.han
cac dung » cach dung, cac duong, tac dung
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 - ((hanh trong) or (anh trong)) cac dung cong sang khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((hanh trong) OR (anh trong)) cac dung cong sang khan cap*.