Perhaps you should try some spelling variations:
cua viet » ca viet, cua vat, cua dieu
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
ve nam » he nam, va nam, le nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((sang ma) or (mang may)) hoi. hieu ve nam thuc va hanh vi ((cua viet) OR (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((sang ma) OR (mang may)) hoi. hieu ve nam thuc va hanh vi ((cua viet) OR (hoa viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((sang ma) or (mang may)) hoi. hieu ve nam thuc va hanh vi ((cua viet) OR (hoa viet))*".