Perhaps you should try some spelling variations:
ban hanh » ban hang
ban anh » ban banh, ban danh, bang anh
sach ky » sach y, sach ty, sach kem
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
va cam » va cham, va cac, va cao
nang o » nang co, nang ho, nang ro
sac ky » cac ky, sai ky
di cuu » di cau, di cua, dinh cuu
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 cam xuc ((ban anh) or (ban hanh)) di cuu 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 cam xuc ((ban anh) OR (ban hanh)) di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) nang o hai. hieu va cam xuc ((ban anh) or (ban hanh)) di cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) nang o hai. hieu va cam xuc ((ban anh) or (ban hanh)) di cuu tre*.