Hi @Chaz, thank you for reaching out! 
As @Bastien_Siebman mentioned, at the moment it is no possible to search for Sections.
With that said, you could search for all task in a particular Section by creating this query:
You will see all the Sections nested in the Project selected on the dropdown menu next to the project name. After selecting the Section you want, you will see the Tasks of that particular Section.
I am aware that it is not exactly what you are looking for but it might be useful to you.
Have a great Friday! 