Perhaps you should try some spelling variations:
khong thuoc » khang thuoc, hong phuoc, dong thuoc
hoc nhanh » hoc phan
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
thuoc la » thuoc ma, thuoc va, thuoc tai
nhan dan » phan dau, gian dan, nhan tai
bo sach » co sach, hoc sach
la hoi » lai hoi, xa hoi, le hoi
hoi ca » hoi cua, hoi cac, hoi cau

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach hoc tap, nghien cuu dong ((hoc nganh) OR (hoc nhanh)) khong thuoc la hoi ca nhan dan~".
• Adding a wildcard symbol may retrieve word variants: bo sach hoc tap, nghien cuu dong ((hoc nganh) OR (hoc nhanh)) khong thuoc la hoi ca nhan dan*.