Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, dai khoa
hanh hoi » hanh thoi, hanh noi, hanh hoa
cac khoi » cac thoi, cac khoan, cach thoi
ban hanh » ban hang
te sach » toc sach
hoi cuu » hoi chu, hoi cua, ho cuu
cuu tre » cua tre, cau tren, cau treo
cam dua » cay dua, chay dua, cach dua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ca dua » cay dua, ca cua, ca da

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((mai khoi) or (cac khoi)). hieu ve ((cam dua) OR (ca dua)) ban hanh hoi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((mai khoi) OR (cac khoi)). hieu ve ((cam dua) OR (ca dua)) ban hanh hoi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((mai khoi) or (cac khoi)). hieu ve ((cam dua) OR (ca dua)) ban hanh hoi cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((mai khoi) or (cac khoi)). hieu ve ((cam dua) OR (ca dua)) ban hanh hoi cuu tre*.