Perhaps you should try some spelling variations:
khang cong » hang cong, thanh cong, dang cong
lieu tinh » trieu tinh, diep tinh, bien tinh
hanh tran » hanh trang, thanh tran, hanh tram
van khang » van khanh, van thanh, van quang
tai phong » tai phuong, giai phong, tai cong
tran van » luan van
so lieu » so dieu

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 - hanh tran van khang cong ((tai phong) or (hai phong)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so lieu tinh - hanh tran van khang cong ((tai phong) OR (hai phong)) tap*.