Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
y nang » ky nang, ly nang, v nang
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao

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