Perhaps you should try some spelling variations:
nhanh chong » thanh cong, khanh phong
nganh khong » nganh cong, nganh nong, nganh khoa
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
ban thanh » ban hanh, ban hang
thanh van » thanh san, thanh toan, thanh phan
sach hoc » cach hoc, sach hoi, mach hoc
cong hoc » dong hoc, cong hoa, cong coc
tu sach » thu sach, su sach, te sach
hoi ban » hoi dan, hoi bai, doi ban
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 sach hoc tap, nghien thu cong hoc ((nganh khong) or (nhanh chong)) hoc ma hoi ban thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien thu cong hoc ((nganh khong) OR (nhanh chong)) hoc ma hoi ban thanh van.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien thu cong hoc ((nganh khong) or (nhanh chong)) hoc ma hoi ban thanh van*.