Perhaps you should try some spelling variations:
khong thuoc » khang thuoc, hong phuoc, khoa thuoc
dong thuoc » dung thuoc, dang thuoc, don thuoc
hoc nhanh » hoc nganh, hoc phan
mach hoc » cach hoc, dich hoc, anh hoc
cuu toan » cuu hoan, cua toan, huu toan
toan hoc » toan khoa, van hoc, hoa hoc
nhan dan » phan dau, gian dan, nhan tai
tu mach » tu cach, tu manh, tu hach
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 tap, nghien cuu toan hoc nhanh ((khong thuoc) OR (dong thuoc)) xa hoi ca nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien cuu toan hoc nhanh ((khong thuoc) OR (dong thuoc)) xa hoi ca nhan dan".
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu toan hoc nhanh ((khong thuoc) OR (dong thuoc)) xa hoi ca nhan dan*.