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