Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thai cua » than cua, tai cuc, tri cua
can ban » toan ban
hau xuc » chat xuc
van hau » van ha, van hai, van dau
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
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 ty)) nang o hai. hieu van hau xuc ((can ban) OR (van ban)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang o hai. hieu van hau xuc ((can ban) OR (van ban)) thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach ty)) nang o hai. hieu van hau xuc ((can ban) OR (van ban)) thai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) nang o hai. hieu van hau xuc ((can ban) OR (van ban)) thai cua tre*.