Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
nam thuc » nam thuoc, am thuc, nam thu
sach hoi » sach doi, sach moi, cach thoi
lieu van » hieu van, sieu van, lieu nano
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
tu sach » thu sach, su sach, te sach
di cua » dai cua, doi cua, de cua

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 ((nang ma) or (sang ma)) hoi. ((lieu van) or (lieu va)) nam thuc va hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi ((nang ma) OR (sang ma)) hoi. ((lieu van) OR (lieu va)) nam thuc va hanh di cua viet*.