Perhaps you should try some spelling variations:
ban thai » ban than, ban thi, ban tai
thai cua » than cua, tai cuc, tri cua
sach ky » sach y, sach ty, sach kem
hieu va » lieu va, hieu qua
hau xuc » chat xuc
xuc can » xuc cam, xuc ban, luc canh
can ban » van ban, toan ban
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
va hau » van hau, va chau, vat hau
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 (sac ky)) nang o hai. hieu va hau xuc can ban thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang o hai. hieu va hau xuc can ban thai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang o hai. hieu va hau xuc can ban thai cua tre*.