Vlookup when more than one possiblity

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Hello,

I'm using the VLOOKUP function to find some place's code within a table.
My problem is that some places in the world are writen the same way but are
not in the same contry and so don't have the same code.
now if i'm using the Vlookup it will only take the first name and sometimes
the wrong code.
How can i do, to let the function make an error if there are two or more
similair places?


thks in advance,
Flo