Perhaps you should try some spelling variations:
khong thuoc » khang thuoc, hong phuoc, khoa thuoc
dong thuoc » dung thuoc, dang thuoc, don thuoc
hoc nganh » hoc nhanh
thu sach » tu sach, thuat sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
cac nhan » ca nhan, cac nha, cam nhan
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoi cac » hoc cac, voi cac, hoa cac
nhan va » nhan tai, nhan dan, nhan tao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach hoc tap, nghien cuu mon hoc nganh ((khong thuoc) or (dong thuoc)) xa hoi cac nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach hoc tap, nghien cuu mon hoc nganh ((khong thuoc) OR (dong thuoc)) xa hoi cac nhan va.
• Adding a wildcard symbol may retrieve word variants: thu sach hoc tap, nghien cuu mon hoc nganh ((khong thuoc) or (dong thuoc)) xa hoi cac nhan va*.