Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
cong cong » cong dong, trong cong, dung cong
nang sang » nang song, nong san
cong nha » cong nhan, cong nhat, cong ha
tac nang » tac vang, tai nang, tap nang
ho hieu » ho chieu, hoi hieu, nho hieu

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 lang - thanh cong nha ((thong cong) or (cong cong)) tac nang sang~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh cong nha ((thong cong) OR (cong cong)) tac nang sang*.