Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
cong cong » cong dong, trong cong, dang cong
dung cong » dung trong
nho hieu » nha hieu, nho sieu, nhu hieu
dang duc » dang quoc, dang su, anh duc
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
dao duc » giao duc, tao duoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: nho hieu lang - anh ((dang duc) OR (dao duc)) ((cong cong) or (dung cong)) dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho hieu lang - anh ((dang duc) OR (dao duc)) ((cong cong) OR (dung cong)) dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nho hieu lang - anh ((dang duc) OR (dao duc)) ((cong cong) or (dung cong)) dan than cau".
• Adding a wildcard symbol may retrieve word variants: nho hieu lang - anh ((dang duc) OR (dao duc)) ((cong cong) or (dung cong)) dan than cau*.