VLOOKUP help

Hey,

I have 2 spreadsheet files, one contains campaigns and keywords columns, the other contains campaigns, keywords, orders and revenue columns.

I need to extract the orders and revenue data from the second sheet for each keyword matched up with the data on the first sheet.

However, some identical keywords are included in more than one campaign so I need to make sure that the keyword sales data is only matched up if it is in the same campaign.

How can you use a VLOOKUP to say "if the keyword in the first sheet is in campaign X, and the keyword in the second sheet is the same, and also in campaign X, then return the order value column, otherwise return 0."

Any help would be much appreciated,

John