Perhaps you should try some spelling variations:
thuc dayn » thuc dan, thuc van, tuc dan
toc sach » hoc sach, doc sach, thuoc sach
thuc day » thuc dan, thuc vat
hanh vai » hanh vi, hanh tai, hanh van
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
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: toc sach y nang xa hoi. lieu va cao ((thuc dayn) or (thuc day)) ((hanh vai) OR (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang xa hoi. lieu va cao ((thuc dayn) OR (thuc day)) ((hanh vai) OR (hanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang xa hoi. lieu va cao ((thuc dayn) or (thuc day)) ((hanh vai) OR (hanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. lieu va cao ((thuc dayn) or (thuc day)) ((hanh vai) OR (hanh va)) cua tre*.