Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
va thanh » gia thanh, ban thanh, va tinh
so sach » so sanh, bo sach, co sach
hoi cua » hoi chuc
hai cua » thai cua, dai cua, lai cua
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
doi hoi » doi thoi, doi voi, doi moi
noi hoi » noi doi, hoi hoi, noi hai
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao

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 y nang ((noi hoi) OR (doi hoi)). hieu va cam thuc va thanh ((hai cua) or (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ((noi hoi) OR (doi hoi)). hieu va cam thuc va thanh ((hai cua) OR (hoi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang ((noi hoi) OR (doi hoi)). hieu va cam thuc va thanh ((hai cua) or (hoi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: so sach y nang ((noi hoi) OR (doi hoi)). hieu va cam thuc va thanh ((hai cua) or (hoi cua)) tre*.