Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
khong thuoc » khang thuoc, hong phuoc, dong thuoc
sach hoc » cach hoc, sach hoi, mach hoc
cong hoc » dong hoc, cong hoa, cong ho
cong coc » cong cuoc, cong cac, cong co
thuoc xa » thuoc ma, thuoc va, thuoc la
tu sach » thu sach, su sach, te sach
va phan » van phan, va phat, va phap
phan va » phan van, nhan va, han va

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 cuu ((cong hoc) or (cong coc)) nganh khong thuoc xa hoi va phan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu ((cong hoc) OR (cong coc)) nganh khong thuoc xa hoi va phan va.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu ((cong hoc) or (cong coc)) nganh khong thuoc xa hoi va phan va*.