Perhaps you should try some spelling variations:
thanh thang » nhanh thang, thanh thanh, thanh hang
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
hang cong » dang cong, hang nong, bang cong
thang tu » thong tu, thanh tu, hang tu
cong tac » cong ty
tu hang » thu hang, tu hanh, tu hung
tac dan » tac danh, cac dan, tac da

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) or (hieu lang)) - thanh thang tu hang cong tac dan ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sach) OR (hieu lang)) - thanh thang tu hang cong tac dan ca.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sach) or (hieu lang)) - thanh thang tu hang cong tac dan ca*.