Perhaps you should try some spelling variations:
chiet tach » chieu sach
nhung cong » dung cong, thong cong, hang cong
doi chiet » doi chieu, doi chi, doi viet
tung tham » tuong tham, tung pham, luong tham
cung tham » cung than, cung thang, luong tham
tran van » luan van
tan van » tang van, luan van, dang van

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chiet tach - thanh ((tung tham) or (cung tham)) nhung cong ((tan van) or (tran van)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chiet tach - thanh ((tung tham) OR (cung tham)) nhung cong ((tan van) OR (tran van)) cau.
• Adding a wildcard symbol may retrieve word variants: doi chiet tach - thanh ((tung tham) or (cung tham)) nhung cong ((tan van) or (tran van)) cau*.