Perhaps you should try some spelling variations:
dinh vai » dinh van, dinh vi, dinh va
vai cua » dai cua, hai cua, lai cua
sach ky » sach y, sach ty, sach kem
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
loc va » hoc va
luc va » duc va, tuc va
sac ky » cac ky, sai ky

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) or (sac ky)) lang xa hoi. hieu va cac ((loc va) OR (luc va)) dinh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) lang xa hoi. hieu va cac ((loc va) OR (luc va)) dinh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) lang xa hoi. hieu va cac ((loc va) OR (luc va)) dinh vai cua tre*".