Perhaps you should try some spelling variations:
khong thuoc » khang thuoc, hong phuoc, dong thuoc
nhan khong » nhan thong, nhanh chong, nganh khong
thuoc moi » hoc moi, thuoc ma, thuoc tai
mach hoc » cach hoc, dich hoc, anh hoc
cuu toan » cuu hoan, cua toan, huu toan
toan hoc » toan khoa, van hoc, hoa hoc
hoc nhan » hoc nhanh, nhoc nhan, hoc phan
nhan dan » phan dau, gian dan, nhan tai
moi hoi » moi thoi, moi doi, moi voi
hoi ca » hoi cua, hoi cac, hoi cau

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 nhan khong thuoc moi hoi ca nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((mach hoc) OR (sinh hoc)) tap, nghien cuu toan hoc nhan khong thuoc moi hoi ca nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu ((mach hoc) or (sinh hoc)) tap, nghien cuu toan hoc nhan khong thuoc moi hoi ca nhan dan*.