Perhaps you should try some spelling variations:
van nhanh » van thanh, van hanh, van khanh
cac xuc » cam xuc, cac nuoc, chat xuc
van anh » van thanh, tuan anh, van minh
hieu ve » hieu va, hieu van
sach ky » sac ky, sach ty, sach kem
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
nang o » nang co, nang ho, nang ro
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 ky) OR (sach y)) nang o hai. hieu ve cac xuc ((van nhanh) or (van anh)) tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang o hai. hieu ve cac xuc ((van nhanh) OR (van anh)) tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach y)) nang o hai. hieu ve cac xuc ((van nhanh) or (van anh)) tri cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach y)) nang o hai. hieu ve cac xuc ((van nhanh) or (van anh)) tri cua tre*.