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
nhan dan » phan dau, gian dan, nhan tai
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)) nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cach hoc tap, nghien cuu toan hoc nhanh dong thuoc ma ((hoi ca) OR (hoi cac)) nhan dan".
• 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)) nhan dan*.