Perhaps you should try some spelling variations:
hanh doi » thanh doi, hanh noi, hang doi
toc sach » hoc sach, doc sach, thuoc sach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
hieu ve » hieu van
hieu va » lieu va, hieu qua
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
xuc va » tuc va, luc va, xac va

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: toc sach vu nang x ho. ((hieu ve) OR (hieu va)) cam ((xuc va) OR (duc va)) hanh doi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach vu nang x ho. ((hieu ve) OR (hieu va)) cam ((xuc va) or (duc va)) hanh doi cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach vu nang x ho. ((hieu ve) OR (hieu va)) cam ((xuc va) or (duc va)) hanh doi cua tre*.