Perhaps you should try some spelling variations:
cach thoi » cac thoi, cach thuc, cach noi
cua viet » ca viet, hoa viet, cua vat
nam thuc » nam thuoc, am thuc, nam thu
sach hoi » sach doi, sach moi, hoach hoi
lieu van » hieu van, sieu van, lieu nano
thuc va » thuc vat, thuc dan, thuc day
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
ma hoi » mai hoi, xa hoi, ma hoa
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) or (cach thoi)) nang 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) OR (cach thoi)) nang ma hoi. ((lieu van) OR (lieu va)) nam thuc va hanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach hoi) or (cach thoi)) nang ma hoi. ((lieu van) or (lieu va)) nam thuc va hanh di cua viet*.