Users can combine two or more filters to search for documents in the Invoices/Documents Library.

To do this, click on the Advanced Search button in the Invoice Library.

Select the first search filter in the 'Property' field. Select the Operator and enter the Value. Click on Add Filter to add the first filter.

To add a second filter, select the second search filter in the 'Property' field. Select the Operator and enter the Value. 

Select the logical operator 'And' or 'OR' depending on the type of condition you would like to use. Then, click on Add Filter to add the second filter.