Perhaps you should try some spelling variations:
dong thuoc » dung thuoc, dang thuoc, don thuoc
cach thoi » cac thoi, cach thuc, cach noi
phan dong » phan cong, phan dang, phan hong
cach hoc » cach thuc, dich hoc, cac hop
cuu toan » cuu hoan, cua toan, huu toan
toan hoc » toan khoa, van hoc, hoa hoc
hoc phan » hoc dan, hoc pho
thuoc xa » thuoc ma, thuoc va, thuoc la
nhan dan » phan dau, gian dan, nhan tai
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 ((cach hoc) or (cach thoi)) tap, nghien cuu toan hoc phan dong thuoc xa hoi ca nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((cach hoc) OR (cach thoi)) tap, nghien cuu toan hoc phan dong thuoc xa hoi ca nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu ((cach hoc) or (cach thoi)) tap, nghien cuu toan hoc phan dong thuoc xa hoi ca nhan dan*.