Perhaps you should try some spelling variations:
phan dau » phan tu, hang dau
hieu ve » hieu va, hieu van
ve phan » va phan, ke phan, ve phat
va hanh » van hanh, va thanh, va danh
hai cua » thai cua, hoi cua, lai cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
dau va » dau ve, lau va
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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: tu sac ky nang ((x hoi) OR (o hoi)). hieu ve phan dau va hanh ((dai cua) OR (hai cua)) cu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((x hoi) OR (o hoi)). hieu ve phan dau va hanh ((dai cua) or (hai cua)) cu~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((x hoi) OR (o hoi)). hieu ve phan dau va hanh ((dai cua) or (hai cua)) cu*.