Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
nang noi » nang doc
hanh via » hanh vi, hanh va, anh va
nam thuc » nam thuoc, am thuc, nam thu
via cua » gia cua, gian cua, giau cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va
hieu ve » hieu van
noi hoi » noi doi, doi hoi, hoi hoi
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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

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