Perhaps you should try some spelling variations:
khong thuoc » hong phuoc, dong thuoc, khoa thuoc
khang thuoc » dang thuoc, hanh thuoc, khau thuoc
hoc nganh » hoc nhanh
cach hoc » cach thuc, cach thoi, dich hoc
cuu toan » cuu hoan, cua toan, huu toan
toan hoc » toan khoa, van hoc, hoa hoc
phan dau » phan tu, hang dau
va cach » va cac
va phan » van phan, va phat, va phap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: va cach hoc tap, nghien cuu toan hoc nganh ((khong thuoc) OR (khang thuoc)) xa hoi va phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "va cach hoc tap, nghien cuu toan hoc nganh ((khong thuoc) OR (khang thuoc)) xa hoi va phan dau".
• Adding a wildcard symbol may retrieve word variants: va cach hoc tap, nghien cuu toan hoc nganh ((khong thuoc) OR (khang thuoc)) xa hoi va phan dau*.