Perhaps you should try some spelling variations:
tang mai » tang ma, tang tai, lang mai
chat dua » chat cua, chat lua, chay dua
ban hang » ngan hang
sach ty » sach y, sach tu, sach thu
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
dua ban » dia ban, cua ban, qua ban
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((cac ky) or (sach ty)) tang mai hoi. hieu ve chat dua ban hang va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((cac ky) OR (sach ty)) tang mai hoi. hieu ve chat dua ban hang va cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((cac ky) or (sach ty)) tang mai hoi. hieu ve chat dua ban hang va cua tre*.