Perhaps you should try some spelling variations:
thanh de » hanh de, thanh ve, thanh do
te sach » toc sach
truc va » thuc va, thuc vat, trung va
hieu va » lieu va
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
luc va » duc va, tuc va, loc va
v nang » va nang, vu nang, van nang
de cua » le cua, te cua, dieu cua
x hoi » xa hoi, o hoi, x ho

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

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