Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
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
ly nang » ky nang, ly hang, ly vang
y nang » ky nang, v nang, may nang
va cao » va cac, va co, va dao
ma hoi » mai hoi, xa hoi, me hoi

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) OR (ly 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 ((y nang) OR (ly 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 ((y nang) OR (ly 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 ((y nang) OR (ly nang)) ((ma hoi) or (ma hoa)). lieu va cao thuc va hanh vai cuu tre*.