Perhaps you should try some spelling variations:
cao thuc » cao thuoc, bao thuc, can thuc
nang doc » nang luc
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
hoi cua » hoi chuc
hai cua » thai cua, dai cua, lai cua
thuc va » thuc vat, thuc dan, thuc day
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va cao » va cac, va co, va dao

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