Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dinh vai » dinh van, dinh vi, dinh va
hieu va » lieu va, hieu qua
va dinh » van dinh, va kinh, va tinh
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
cac tu » cac thu, cach tu, cac du
x hoi » xa hoi, o hoi, x ho

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 (toc sach)) ky nang x hoi. hieu va cac tu va dinh vai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky nang x hoi. hieu va cac tu va dinh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ky nang x hoi. hieu va cac tu va dinh vai cuu tre*.