Perhaps you should try some spelling variations:
ban hanh » ban hang
ban anh » ban banh, ban danh, bang anh
cac xuc » cam xuc, cac nuoc, chat xuc
sach ty » sach y, sach thu, xach tay
hieu va » lieu va, hieu qua
sach tu » sach thu, cach tu, sach uu
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 ty) OR (sach tu)) nang o hai. hieu va cac xuc ((ban anh) or (ban hanh)) di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach tu)) nang o hai. hieu va cac xuc ((ban anh) OR (ban hanh)) di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach tu)) nang o hai. hieu va cac xuc ((ban anh) or (ban hanh)) di cuu tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach tu)) nang o hai. hieu va cac xuc ((ban anh) or (ban hanh)) di cuu tre*.