Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
hang tai » hang va, dung tai
tu sach » thu sach, su sach, te sach
tai cuu » tai cuc, tai buu, tai cua
va hang » van hang, va nang, va lang
hieu ve » hieu va, hieu van
ky lang » ky nang, ky dang, ky tang
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
xuc va » duc va, tuc va, luc va

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 lang ((mai khoi) or (cac khoan)). ((hieu ve) or (hieu qua)) cam xuc va hang tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang ((mai khoi) OR (cac khoan)). ((hieu ve) OR (hieu qua)) cam xuc va hang tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang ((mai khoi) or (cac khoan)). ((hieu ve) or (hieu qua)) cam xuc va hang tai cuu tre*.