Perhaps you should try some spelling variations:
ban danh » ban doanh, ban hanh, ban dan
ban banh » ban hanh, ban anh, ban thanh
hieu van » hieu va, thien van, lieu va
cam cuc » cam xuc, cham cuu, pham cuc
van cam » van nam, van lam, van cau
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo
sac ky » cac ky, sai ky
di cuu » di cau, di cua, dinh cuu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) or (sac ky)) nang xa hoi. hieu van cam cuc ((ban banh) OR (ban danh)) di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sac ky)) nang xa hoi. hieu van cam cuc ((ban banh) OR (ban danh)) di cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sac ky)) nang xa hoi. hieu van cam cuc ((ban banh) OR (ban danh)) di cuu tre*".