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, cuu tre, cua triet
te cac » tu cac, te cao, de cac
ve cac » va cac, vien cac
va cua » va chua, via cua, ca cua

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) OR (ve cac)) ky tang mai hoi. hieu qua ((than so) OR (than doc)) ban hang va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te cac) OR (ve cac)) ky tang mai hoi. hieu qua ((than so) or (than doc)) ban hang va cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te cac) OR (ve cac)) ky tang mai hoi. hieu qua ((than so) or (than doc)) ban hang va cua tre*.