Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
dua ban » dia ban, cua ban, qua ban
ky mang » ky nang, ke mang, ky dang
may hoi » may thoi, tay hoi, mai hoi
hoi cua » hoi chuc
hai cua » thai cua, dai cua, lai cua
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky
ve cai » va cai, ve cac, ve tai
ve ca » ve cac, ve cau, ve cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky mang may hoi. hieu ((ve ca) or (ve cai)) dua ban thanh ((hai cua) OR (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky mang may hoi. hieu ((ve ca) OR (ve cai)) dua ban thanh ((hai cua) OR (hoi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky mang may hoi. hieu ((ve ca) or (ve cai)) dua ban thanh ((hai cua) OR (hoi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su xac ky mang may hoi. hieu ((ve ca) or (ve cai)) dua ban thanh ((hai cua) OR (hoi cua)) tre*.