Perhaps you should try some spelling variations:
nhanh khong » nhanh chong, nganh khong, nhan khong
nghien huu » nghien cuu, nguyen huu, nhiem huu
khong hoc » khung hoc, thong hoc, khong thuoc
sach hoi » sach doi, sach moi, cach thoi
van phan » van phong, van thanh, luan phan
phan van » pham van, thanh van, luan van
tu sach » thu sach, su sach, te sach
hoi tap » hoi dap, hoc tap, hoi tai
mot hoc » mon hoc, mo hoc, bot hoc
hoa van » hoa dan, hoang van, hoa phan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi tap, nghien huu ((mot hoc) OR (mot goc)) nhanh khong hoc ma hoa van phan van~.
• Adding a wildcard symbol may retrieve word variants: tu sach hoi tap, nghien huu ((mot hoc) or (mot goc)) nhanh khong hoc ma hoa van phan van*.