Perhaps you should try some spelling variations:
ban hanh » ban hang
sach ky » sac ky, sach ty, sach kem
qua cam » qua cham, qua cac, qua ca
ban anh » ban banh, ban danh, bang anh
cuu tre » cua tre, cau tren, cau treo
nang o » nang co, nang ho, nang ro
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: su ((sach ky) or (sach y)) nang o hai. hieu qua cam xuc ((ban anh) or (ban hanh)) di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) nang o hai. hieu qua cam xuc ((ban anh) OR (ban hanh)) di cuu tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach y)) nang o hai. hieu qua cam xuc ((ban anh) or (ban hanh)) di cuu tre*.