Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
thanh van » thanh san, thanh toan, thanh phan
toc sach » hoc sach, doc sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
tung hoc » trung hoc, tuong hoc, dung hoc
pho cong » pho uong, cho cong, pho dong
cong hoc » dong hoc, cong hoa, cong coc
phan van » pham van, luan van, tran van
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach hoc tap, nghien huu tung hoc pho cong hoc xa hoi va ((phan van) or (thanh van))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach hoc tap, nghien huu tung hoc pho cong hoc xa hoi va ((phan van) OR (thanh van)).
• Adding a wildcard symbol may retrieve word variants: toc sach hoc tap, nghien huu tung hoc pho cong hoc xa hoi va ((phan van) or (thanh van))*.