Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, dai khoa
hanh tai » thanh tai, hang tai, han tai
cac khoi » cac thoi, cac khoan, cach thoi
te sach » toc sach
tai cuu » tai cuc, tai buu, tai cua
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
va cam » va cham, va cac, va cao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang ((mai khoi) OR (cac khoi)). hieu ((va cam) OR (ve cac)) xuc va hanh tai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang ((mai khoi) OR (cac khoi)). hieu ((va cam) or (ve cac)) xuc va hanh tai cuu tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang ((mai khoi) OR (cac khoi)). hieu ((va cam) or (ve cac)) xuc va hanh tai cuu tre*.