Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
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 » thuoc ma, thuong va, thuoc tai
phap vat » phap luat, phap phat, phap viet
so sach » so sanh, bo sach, co sach
thuc va » thuc vat, thuc dan, thuc day
hoi ban » hoi dan, hoi bai, doi ban

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) OR (thuc va)) hoi ban 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) OR (thuc va)) hoi ban phap vat".
• Adding a wildcard symbol may retrieve word variants: so sach hoc tap, nghien cuu dong hoc nganh khong ((thuoc va) OR (thuc va)) hoi ban phap vat*.