Perhaps you should try some spelling variations:
thanh de » hanh de, thanh ve, thanh do
thanh di » thanh doi, thanh do, thanh dinh
xuc gia » duc gia, luc gia, tuc gia
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach vay
va cam » va cham, va cac, va cao
sach 2 » sach y

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) OR (sach 2)) nang cao hoi. hieu va cam xuc gia ((thanh di) or (thanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach v) OR (sach 2)) nang cao hoi. hieu va cam xuc gia ((thanh di) OR (thanh de)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach v) OR (sach 2)) nang cao hoi. hieu va cam xuc gia ((thanh di) or (thanh de)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach v) OR (sach 2)) nang cao hoi. hieu va cam xuc gia ((thanh di) or (thanh de)) cua tre*.