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
thuoc mai » thuoc ma, thuoc tai, thuoc moi
mach hoc » cach hoc, dich hoc, anh hoc
cuu toan » cuu hoan, cua toan, huu toan
toan hoc » toan khoa, van hoc, hoa hoc
mai khoi » mai khoa, tai khoa, cac khoi
nhan tai » hang tai, van tai, toan tai
khoi ca » khoi can, khoi cua, khoi 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 ((mach hoc) or (sinh hoc)) tap, nghien cuu toan hoc nhanh dong thuoc mai khoi ca nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((mach hoc) OR (sinh hoc)) tap, nghien cuu toan hoc nhanh dong thuoc mai khoi ca nhan tai.
• Adding a wildcard symbol may retrieve word variants: tu ((mach hoc) or (sinh hoc)) tap, nghien cuu toan hoc nhanh dong thuoc mai khoi ca nhan tai*.