Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sinh dai » sinh thai, si dai, sinh vat
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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 xa hoi. hieu va chat ((xuc va) OR (luc va)) sinh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang xa hoi. hieu va chat ((xuc va) OR (luc va)) sinh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang xa hoi. hieu va chat ((xuc va) OR (luc va)) sinh dai cua tre*.