Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thai cua » than cua, tai cuc, tri cua
van dinh » van minh, van dich, xuan dinh
tu sach » thu sach, su sach, te sach
va dinh » va kinh, va tinh, vu dinh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
nang ro » nang co, nang ho, nang ra
cua tre » cua te, cuu tre, cua triet
ro hai » co hai, o hai, so hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ro hai. ((hieu ve) or (hieu van)) cam xuc ((van dinh) OR (va dinh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ro hai. ((hieu ve) OR (hieu van)) cam xuc ((van dinh) OR (va dinh)) thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ro hai. ((hieu ve) or (hieu van)) cam xuc ((van dinh) OR (va dinh)) thai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ro hai. ((hieu ve) or (hieu van)) cam xuc ((van dinh) OR (va dinh)) thai cua tre*.