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