In Customers list its working fine.
You can see the Macro , in Follow-up form
SetTempVar strFilter, "([Place of Installation] Like ""*" & [TempVars]![strSearch] & "*"")"
SetTempVar strFilter, [TempVars]![strFilter] & " OR ([Customer Name] Like ""*" & [TempVars]![strSearch] & "*"")"
SetTempVar strFilter, [TempVars]![strFilter] & " OR ([Company Name] Like ""*" & [TempVars]![strSearch] & "*"")"
SetTempVar strFilter, [TempVars]![strFilter] & " OR ([Phone Number] Like ""*" & [TempVars]![strSearch] & "*"")"