Perhaps you should try some spelling variations:
tang mai » tang ma, tang tai, lang mai
ban hang » ngan hang
ky tang » ky nang, ky dang, kho tang
mai hoi » mai khoi, dai hoi, lai hoi
than so » than sao, than vo, than go
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
te cac » tu cac, ve cac, te 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 cac ky tang mai hoi. hieu qua ((than so) OR (than doc)) ban hang va ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky tang mai hoi. hieu qua ((than so) or (than doc)) ban hang va ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: te cac ky tang mai hoi. hieu qua ((than so) or (than doc)) ban hang va ((cua tre) OR (cuu tre))*.