Perhaps you should try some spelling variations:
nhanh dong » hanh dong, nhanh chong, anh dong
dong thuoc » dung thuoc, dang thuoc, don thuoc
hoc nhanh » hoc nganh, hoc phan
cach hoc » cach thuc, cach thoi, dich hoc
cuu toan » cuu hoan, cua toan, huu toan
toan hoc » toan khoa, van hoc, hoa hoc
thuoc ma » hoc ma, duoc ma
phan dau » phan tu, hang dau
tu cach » tu cac
hoi cac » hoc cac, voi cac, hoa cac
hoi ca » hoi cua, hoi cau, hoi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cach hoc tap, nghien cuu toan hoc nhanh dong thuoc ma ((hoi ca) or (hoi cac)) phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach hoc tap, nghien cuu toan hoc nhanh dong thuoc ma ((hoi ca) OR (hoi cac)) phan dau.
• Adding a wildcard symbol may retrieve word variants: tu cach hoc tap, nghien cuu toan hoc nhanh dong thuoc ma ((hoi ca) or (hoi cac)) phan dau*.