Perhaps you should try some spelling variations:
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
tong cong » trong cong, cong cong, dung cong
cong tran » cong tan, cong tuan, cong toan
tranh ha » thanh ha, trang ha, trinh ha
tran van » luan van
ha tong » han tong, ha dong, ha tang

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) or (nhieu tang)) - canh tranh ha tong cong tran van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (nhieu tang)) - canh tranh ha tong cong tran van ban*.