Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
hoc thanh » hoc nhanh, hoan thanh, hoc phan
sach hoc » cach hoc, mach hoc, sach duoc
sach hoi » sach doi, sach moi, cach thoi
cong hoc » dong hoc, cong hoa, cong coc
phan dan » phan dang, phan dau, nhan dan
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
va phan » van phan, va phat, va phap
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: thu ((sach hoc) or (sach hoi)) tap, nghien huu mot hoc thanh cong hoc xa hoi va phan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach hoc) OR (sach hoi)) tap, nghien huu mot hoc thanh cong hoc xa hoi va phan dan.
• Adding a wildcard symbol may retrieve word variants: thu ((sach hoc) or (sach hoi)) tap, nghien huu mot hoc thanh cong hoc xa hoi va phan dan*.