Perhaps you should try some spelling variations:
thanh thang » nhanh thang, thanh thanh, thanh hang
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
hieu van » hieu va, thien van, lieu va
thang tu » thong tu, thanh tu, hang tu
tu nhung » tu chung, cua nhung, thi nhung
cong tac » cong ty
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 ((hieu lang) or (hieu van)) - thanh thang tu nhung cong tac dan ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu lang) OR (hieu van)) - thanh thang tu nhung cong tac dan ca.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu lang) or (hieu van)) - thanh thang tu nhung cong tac dan ca*.