Perhaps you should try some spelling variations:
ngan nhung » ngan hang, gian nhung, nam nhung
nhung cong » dung cong, thong cong, hang cong
hieu quan » hieu qua, lieu quan, thien quan
hieu lang » chieu sang, hieu quang, nhieu tang
cong dan » cong san, cong tan, huong dan
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: ho ((hieu quan) or (hieu lang)) - hanh chinh ngan nhung cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quan) OR (hieu lang)) - hanh chinh ngan nhung cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quan) or (hieu lang)) - hanh chinh ngan nhung cong dan than cau*.