Yes, you can easily do it. Say, you need to display products with a price of $5 - $20. In this case you should add multiple price conditions like "price greater than $5" and "price less than $20" as well as multiple attributes conditions:
To fix it please navigate to Admin Panel > Catalog > Attribute > Manage Attributes > select the needed attribute there and set the “Used in Product Listing” option to “Yes”. Please note that re-indexation is required after this action.
If you get a “There are no products matching the selection” message on the landing page, please check the settings of the root category. For the correct work of the Landing Pages extension “Is Anchor” option of Root category should be set to “Yes”: