How to add or condition statements in Discover query builder

I am trying to write a query is Discover and I want to get all errors with either the tag section with value “abcd” or with section with value “efgh”, where the section is a custom tag I set on the error in beforeSendHandler.
Apparently when I use or for the same item (tag) its not working

i.e., query: customTag: or customTag:efgh not working