Perhaps you should try some spelling variations:
ban hang » ngan hang
te sach » toc sach
hieu ve » hieu va, hieu van
cac dua » cach dua, cac qua, cac du
dua ban » dia ban, cua ban, qua ban
vai cua » hai cua, lai cua, bai cua
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach v nang ((x hoi) OR (x ho)). hieu ve cac dua ban hang ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang ((x hoi) OR (x ho)). hieu ve cac dua ban hang ((vai cua) OR (dai cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v nang ((x hoi) OR (x ho)). hieu ve cac dua ban hang ((vai cua) or (dai cua)) tre*".