Perhaps you should try some spelling variations:
lieu tinh » trieu tinh, diep tinh, bien tinh
luan tong » luan tuong, luan cong, luan dong
tong cong » trong cong, cong cong, dung cong
anh tang » anh bang, anh dang, anh nang
cong tan » cong tac, cong san, cong thanh
so lieu » so dieu
tan van » tran van, tang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: so lieu tinh - ((canh tranh) or (anh tang)) luan tong cong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so lieu tinh - ((canh tranh) OR (anh tang)) luan tong cong tan van ban*.