Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
hanh hang » thanh hang, hang hang, hanh han
dung cong » dung trong
hang qua » hang quan, hang cua, hanh qua
qua dung » quang dung, su dung, qua song
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu lang) or (chieu sach)) - hanh hang qua dung cong ((dan than) or (van than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (chieu sach)) - hanh hang qua dung cong ((dan than) OR (van than)) cao.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (chieu sach)) - hanh hang qua dung cong ((dan than) or (van than)) cao*.