Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
sach ya » sach xa, sach ha, sach va
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau
vi cua » vai cua, di cua

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) or (sach ya)) lang xa hoi. lieu va cau thuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach y) OR (sach ya)) lang xa hoi. lieu va cau thuc van hanh vi cua tre*.