Perhaps you should try some spelling variations:
hanh cac » hang cac, hanh cat, nhanh cay
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cac tac » cac toc, cac bac, cac dac
hanh ca » hanh cat, hanh cua, hanh cad
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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 da ((hanh ca) OR (hanh cac)) 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 da ((hanh ca) OR (hanh cac)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach v nang ((le hoi) or (ma hoa)). hieu va cac tac da ((hanh ca) OR (hanh cac)) cua tre*.