Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
hoc khanh » hoc nhanh, hoc thanh, hoc hanh
phong hoc » phong ho, thong hoc, phuong hoa
tung hoc » trung hoc, tuong hoc, dung hoc
tin hoc » sinh hoc
va nhan » van nhan, va phan, va nha
tu tin » thu tin, tu tieng, tru tinh
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu tin hoc tap, nghien huu tung hoc khanh phong hoc ma hoi ((va nhan) or (ca nhan)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu tin hoc tap, nghien huu tung hoc khanh phong hoc ma hoi ((va nhan) OR (ca nhan)) van.
• Adding a wildcard symbol may retrieve word variants: tu tin hoc tap, nghien huu tung hoc khanh phong hoc ma hoi ((va nhan) or (ca nhan)) van*.