A powerful feature of pivot tables is that you can filter a pivot field, to see specific results. However, if you apply a different filter to that pivot field, the first filter is removed. For example, if you filter a Row field for region names starting with "East", and then add a Top 10 filter, the "East" filter is removed.
Use the technique shown in this video to apply multiple pivot table filters at the same time. You can use a Label filter, Value filter and Manual filter simultaneously, to fine tune your pivot table reports.