Perhaps you should try some spelling variations:
nhieu tang » chieu sang, nhiet nang
nganh nong » nganh cong
hieu lang » chieu sang, hieu quang, hieu van
ganh nang » anh nang, van nang, sach nang
doc cong » hoc cong, duc cong, do cong
dong dan » dong danh, duong dan, dong san
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) or (nhieu tang)) - ((ganh nang) OR (nganh nong)) doc cong dong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((hieu lang) OR (nhieu tang)) - ((ganh nang) OR (nganh nong)) doc cong dong dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi ((hieu lang) or (nhieu tang)) - ((ganh nang) OR (nganh nong)) doc cong dong dan than cau".
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu lang) or (nhieu tang)) - ((ganh nang) OR (nganh nong)) doc cong dong dan than cau*.