Perhaps you should try some spelling variations:
luan thong » luan phong, luan tuong, luat thong
thong cong » trong cong, tong cong, thong thong
lieu tinh » trieu tinh, diep tinh, bien tinh
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 thong 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 thong cong tan van ban*.