Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thanh de » thanh ve, thanh do, thanh le
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va
xuc gia » duc gia, luc gia, tuc gia
hanh de » hanh ve, hanh kem
cuu tre » cua tre, cau tren, cau treo
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.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach v nang cao hoi. ((hieu va) OR (hieu qua)) cam xuc gia ((thanh de) or (hanh de)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v nang cao hoi. ((hieu va) OR (hieu qua)) cam xuc gia ((thanh de) OR (hanh de)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach v nang cao hoi. ((hieu va) OR (hieu qua)) cam xuc gia ((thanh de) or (hanh de)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sach v nang cao hoi. ((hieu va) OR (hieu qua)) cam xuc gia ((thanh de) or (hanh de)) cuu tre*.