Perhaps you should try some spelling variations:
sanh ban » sang ban, sanh dan, sinh ban
ban cua » ban quan
sach ky » sac ky, sach y, sach kem
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
ca phoi » cap phoi, cay phoi, gap phoi
dang ca » dang cac, dan ca, hang ca
sach ty » sach y, sach tu, sach thu
luc va » duc va, tuc va
loc va » hoc va
va cao » va cac, va co, va dao

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 (sach ty)) dang ca phoi. hieu va cao ((luc va) OR (loc va)) sanh ban cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) dang ca phoi. hieu va cao ((luc va) OR (loc va)) sanh ban cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach ty)) dang ca phoi. hieu va cao ((luc va) OR (loc va)) sanh ban cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) dang ca phoi. hieu va cao ((luc va) OR (loc va)) sanh ban cua tre*.