Perhaps you should try some spelling variations:
khong thuoc » khang thuoc, hong phuoc, dong thuoc
nganh khong » nganh cong, nhanh chong, nganh nong
sach hoi » sach doi, sach moi, cach thoi
dong hoc » dong co, dong luc
thuoc xa » thuoc ma, thuoc va, thuoc la
tu sach » thu sach, su sach, te sach
hoi tap » hoi dap, hoc tap, hoi tai
mon hoc » toan hoc
va nhan » van nhan, ca nhan, va phan
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: tu sach hoi tap, nghien cuu ((mon hoc) OR (dong hoc)) nganh khong thuoc xa hoi va nhan va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoi tap, nghien cuu ((mon hoc) OR (dong hoc)) nganh khong thuoc xa hoi va nhan va".
• Adding a wildcard symbol may retrieve word variants: tu sach hoi tap, nghien cuu ((mon hoc) OR (dong hoc)) nganh khong thuoc xa hoi va nhan va*.