Perhaps you should try some spelling variations:
khong thuoc » hong phuoc, dong thuoc, khoa thuoc
khang thuoc » dang thuoc, hanh thuoc, khau thuoc
nghien cua » nghien cuu, nghiep cua, nghiep vua
hoc nhanh » hoc nganh, hoc phan
sach hoc » cach hoc, sach hoi, mach hoc
van nhan » van phan, van thanh, danh nhan
nhan van » nhan dan, nhan va, phan van
tu sach » thu sach, su sach, te sach
mot hoc » mon hoc, mo hoc, mot goc
hoi van » hoi va, hoi dan, hai van

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 cua mot hoc nhanh ((khong thuoc) OR (khang thuoc)) xa hoi van nhan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cua mot hoc nhanh ((khong thuoc) OR (khang thuoc)) xa hoi van nhan van".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cua mot hoc nhanh ((khong thuoc) OR (khang thuoc)) xa hoi van nhan van*.