Perhaps you should try some spelling variations:
thanh de » hanh de, thanh ve, thanh do
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va
loc va » hoc va
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 y nang x hoi. hieu ((van nam) or (van lam)) ((luc va) OR (loc va)) thanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang x hoi. hieu ((van nam) OR (van lam)) ((luc va) OR (loc va)) thanh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang x hoi. hieu ((van nam) or (van lam)) ((luc va) OR (loc va)) thanh de cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang x hoi. hieu ((van nam) or (van lam)) ((luc va) OR (loc va)) thanh de cua tre*.