Perhaps you should try some spelling variations:
van nhanh » van thanh, van hanh, van nhan
van khanh » van thanh, van hanh, van anh
tu sach » thu sach, su sach, te sach
nang ro » nang co, nang ho, nang ra
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ro hai » co hai, o hai, so hai
ve cac » vien cac

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. hieu ((ve cac) OR (va cac)) xuc ((van nhanh) or (van khanh)) tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ro hai. hieu ((ve cac) OR (va cac)) xuc ((van nhanh) OR (van khanh)) tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ro hai. hieu ((ve cac) OR (va cac)) xuc ((van nhanh) or (van khanh)) tri cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ro hai. hieu ((ve cac) OR (va cac)) xuc ((van nhanh) or (van khanh)) tri cua tre*.