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 cong » cua cong, thu cong, cac cong
thuoc xa » thuoc ma, thuoc va, thuoc la
nhan van » nhan dan, nhan va, phan van
tu sach » thu sach, su sach, te sach
va nhan » van nhan, ca nhan, va phan

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: "tu sach hoc tap, nghien cuu cong ((hoc nhanh) OR (hoc nganh)) khong thuoc xa hoi va nhan van~".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu cong ((hoc nhanh) OR (hoc nganh)) khong thuoc xa hoi va nhan van*.