Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
nang xa » nang x, lang xa, nang ma
va cam » va cham, va cac, va cao
va dan » va dau, va dap, va dai
y nang » ky nang, ly nang, v nang
va dao » ca dao
ca dan » cac dan, ca dao
du cuu » tu cuu

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. hieu va cam xuc ((((va dan) OR (va dao))) or (ca dan)) du cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang xa hoi. hieu va cam xuc ((((va dan) OR (va dao))) OR (ca dan)) du cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang xa hoi. hieu va cam xuc ((((va dan) OR (va dao))) or (ca dan)) du cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. hieu va cam xuc ((((va dan) OR (va dao))) or (ca dan)) du cuu tre*.