Perhaps you should try some spelling variations:
thanh thang » nhanh thang, thanh thanh, thanh hang
chieu sach » chinh sach, chiet tach, chieu sang
dang cong » dung cong
cong lang » cong vang, cong luong, cong quang
lang than » lang thang, lang thanh, sang than
hieu van » hieu va, thien van, lieu va
thang tu » thong tu, thanh tu, hang tu
than cap » khan cap, thanh lap, thanh cac
tu dang » thu dang, tu dong, su dang

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