Perhaps you should try some spelling variations:
khong thuoc » khang thuoc, hong phuoc, dong thuoc
hoc nganh » hoc nhanh
don thuoc » dong thuoc, dung thuoc, dang thuoc
sach hoc » cach hoc, sach hoi, mach hoc
tu sach » thu sach, su sach, te sach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
nhan va » nhan tai, nhan dan, nhan tao
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 sach hoc tap, nghien cuu mon hoc nganh ((khong thuoc) or (don thuoc)) xa hoi ca nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu mon hoc nganh ((khong thuoc) OR (don thuoc)) xa hoi ca nhan va.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu mon hoc nganh ((khong thuoc) or (don thuoc)) xa hoi ca nhan va*.