Perhaps you should try some spelling variations:
ban hanh » ban hang
hanh va » hang va, hanh vi
duc ban » duc tan, duc van, dua ban
tu sai » tu bai, tu san, tu cai
ve cac » va cac, vien cac
va cua » va chua, via cua, ca cua
cua cu » cua chu, cua cau, cua su
sai ky » sac ky
ve cam » ve cham, va cam, ve cai
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 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: tu sai ky nang ((x hoi) or (o hoi)). hieu ((ve cam) or (ve cac)) duc ban hanh va cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky nang ((x hoi) OR (o hoi)). hieu ((ve cam) OR (ve cac)) duc ban hanh va cua cu.
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang ((x hoi) or (o hoi)). hieu ((ve cam) or (ve cac)) duc ban hanh va cua cu*.