Perhaps you should try some spelling variations:
van nhanh » van thanh, van khanh, van nhan
hieu van » hieu va, thien van, lieu va
van chat » cao chat
van hanh » van thanh, ban hanh, van anh
chat xuc » chat huu, cam xuc, chao xu
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ro hai » co hai, so hai, do hai
o hai » co hai, so hai, o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang ((ro hai) OR (o hai)). hieu van chat xuc ((van nhanh) or (van hanh)) tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((ro hai) OR (o hai)). hieu van chat xuc ((van nhanh) OR (van hanh)) tri cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((ro hai) OR (o hai)). hieu van chat xuc ((van nhanh) or (van hanh)) tri cua tre*".