Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hanh ca » hanh cac, hanh cat, hanh cua
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
tac va » tac da, tuc va, tac ha
tac xa » tuc xa, tac da
v nang » va nang, vu nang, van nang
ca cua » co cua

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

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