Perhaps you should try some spelling variations:
thanh thong » thanh thuong, thanh hong, thanh thang
nhung cong » thong cong, hang cong, nhung don
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
tan nhanh » tai nhanh, tan nhan, tan thanh
nhanh cau » nhanh cay, thanh chau, nhanh ha
doc hieu » toc thieu, hoc thieu, hoc hien

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 - thanh thong tin ((nhung cong) or (dung cong)) tan nhanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - thanh thong tin ((nhung cong) OR (dung cong)) tan nhanh cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - thanh thong tin ((nhung cong) or (dung cong)) tan nhanh cau*.