Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
duong dan » duong dang, huong dan, duong van
hoi hieu » hoi phieu, hoi tieu, moi hieu
anh nang » ganh nang, anh bang, anh dang
doc cong » hoc cong, do cong, doi cong
duc cong » duc cuong, nuoc cong, chuc cong
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi hieu lang - anh nang ((doc cong) or (duc cong)) duong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - anh nang ((doc cong) OR (duc cong)) duong dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - anh nang ((doc cong) or (duc cong)) duong dan than cau*.