Perhaps you should try some spelling variations:
ban hang » ngan hang
cuu tre » cua tre, cau tren, cau treo
va danh » va dinh, va dan, va hanh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
bai ky » ban ky, sai ky, bac ky
di cuu » di cau, di cua, dinh cuu
tu bai » tu ban, tu bat, te bai
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 bai ky nang ((x hoi) or (o hoi)). hieu ve cham soc ((ban hang) or (va danh)) di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ky nang ((x hoi) OR (o hoi)). hieu ve cham soc ((ban hang) OR (va danh)) di cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu bai ky nang ((x hoi) or (o hoi)). hieu ve cham soc ((ban hang) or (va danh)) di cuu tre*.