Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cao thuc » cao thuoc, can thuc, cao thu
bao thuc » cao thuoc, am thuc, va thuc
hanh vai » hanh vi, hanh va, hanh tai
te sach » toc sach
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
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.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (hoc sach)) y nang xa hoi. lieu va ((cao thuc) OR (bao thuc)) va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (hoc sach)) y nang xa hoi. lieu va ((cao thuc) OR (bao thuc)) va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (hoc sach)) y nang xa hoi. lieu va ((cao thuc) OR (bao thuc)) va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (hoc sach)) y nang xa hoi. lieu va ((cao thuc) OR (bao thuc)) va hanh vai cua tre*.