Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
hanh vai » hanh vi, hanh va, hanh tai
cao thuc » cao thuoc, bao thuc, can thuc
vai cuu » vai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cua tre, cau tren, cau treo
va cao » va cac, va co, va dao
ma hoi » mai hoi, xa hoi, me hoi
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: ((toc sach) OR (doc sach)) y nang ((ma hoi) or (ma hoa)). lieu va cao thuc va hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) y nang ((ma hoi) OR (ma hoa)). lieu va cao thuc va hanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) y nang ((ma hoi) or (ma hoa)). lieu va cao thuc va hanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) y nang ((ma hoi) or (ma hoa)). lieu va cao thuc va hanh vai cuu tre*.