Gmail offers a search feature which is similar to Google search. It is very easy to use. You can find emails from more than 1 sender in one search.
If you want to find all emails from any sender you need to use from: senders name
But the same time if you are looking for all the emails from David and Solomon, you can use the operator OR as seen below
From:David OR From:Solomon
You need enter the first search criteria and a space and OR and a space then the second search criteria.
OR should be uppercase.
This search will bring the emails from David and Solomon.
You can also add more criteria using OR
If you want to find emails from David and also emails sent to Solomon, you can use the search to: as seen below
This search will bring all the emails received from David and sent to Solomon
If you have any questions or suggestions, please post a comment.