Vlookup in Tabs

Hello,

I am trying to make a VLookup in A file which has tabs per month with the year added to it.
ON the front page I want to make the user enter the Month + Year of which they want the data to display and based on that the Vlookup for the data should appear correctly automatically. Somehow it seems Excel is not recognizing my formula to create the Tab Name as being a Tab name within the VLookup. Anyone knows how to solve my problem?

Data to fill in is in cells Row B.
I created a formula to make teh "Tab Name" IN cell F13: =("'"&B3&" "&B4&"'"&"!"&"F1:AJ36")
V Lookup Looks Like: =VLOOKUP(J2;F13:AJ36;5;FALSE)

Sheet attached. Thank you for the help!