Perhaps you should try some spelling variations:
ban hang » ngan hang
va danh » va dinh, va dan, va hanh
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
di cua » dai cua, doi cua, de cua
di cuu » di cau, dinh cuu
tu can » tu ban, tu cac, thu canh
can ky » van ky, dan ky, ban ky
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 o hoi. hieu ve cham soc ((ban hang) or (va danh)) ((di cuu) OR (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu can ky nang o hoi. hieu ve cham soc ((ban hang) OR (va danh)) ((di cuu) OR (di cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu can ky nang o hoi. hieu ve cham soc ((ban hang) or (va danh)) ((di cuu) OR (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu can ky nang o hoi. hieu ve cham soc ((ban hang) or (va danh)) ((di cuu) OR (di cua)) tre*.