Perhaps you should try some spelling variations:
ban danh » ban doanh, ban hanh, ban dan
ban anh » ban hanh, ban banh, bang anh
sach ky » sach y, sach ty, sach kem
hieu va » lieu va, hieu qua
cau tre » cau tren, cau treo, cau tra
va cam » va cham, va cac, va cao
nang o » nang co, nang ho, nang ro
sac ky » cac ky, sai ky
di cau » da cau, diem cau
o hoi » co hoi, o hoc, o hai

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 hoi. hieu va cam xuc ((ban anh) or (ban danh)) di cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang o hoi. hieu va cam xuc ((ban anh) OR (ban danh)) di cau tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang o hoi. hieu va cam xuc ((ban anh) or (ban danh)) di cau tre*.