When creating an Advanced Search or Personal View, you will be prompted on whether you are looking for all or any criteria and/or exceptions. Selecting all will include items that meet every one of the criteria and exceptions specified. Selecting any will include those items that meet at least one of the criteria and exceptions specified.

For example, if you create an Advanced Search for presentations created within the last month, you need to select all from the criteria drop-down list. If you select any, you will see every document created in the last month as well as every presentation, regardless of when it was created.