Support for OR conditions is planned for a future release, but has not been implemented yet. If the names are similar you can use a wildcard, for example 'ElementName:Element*', and it will match any element names that start with 'Element'.
In addition to David Hearn 's suggestion on using a wildcard on similar names, PI AF 2017 R2 (AF SDK 2.9.5) introduced the concept of nested queries as well as some additional filters. With a nested query, you may have a more complex element search rather than just on the element name. You may include a combination of template or category along with name. If your desired elements are immediate children of another element, you may use the new Parent filter.
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I have used categories in the past to get around this. It doesn't always make sense for ad-hoc queries, but if you always report on the elements, you can add a reporting category and filter using the category.