Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thanh de » hanh de, thanh ve, thanh do
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va cam » va cham, va cao, va cai
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
de cua » le cua, te cua, dieu cua

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

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