Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
khong thuoc » khang thuoc, hong phuoc, dong thuoc
hoc nganh » hoc nhanh
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
thuoc va » thuc va, thuoc ma, thuong va
phap vat » phap luat, phap phat, phap viet
so sach » so sanh, bo sach, co sach
hoi ban » hoi bai, doi ban, hoc ban
hoi dan » hoa dan, hoc dan, hoi dap

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach hoc tap, nghien cuu dong hoc nganh khong thuoc va ((hoi ban) OR (hoi dan)) phap vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach hoc tap, nghien cuu dong hoc nganh khong thuoc va ((hoi ban) OR (hoi dan)) phap vat".
• Adding a wildcard symbol may retrieve word variants: so sach hoc tap, nghien cuu dong hoc nganh khong thuoc va ((hoi ban) OR (hoi dan)) phap vat*.