Hi!
It was confusing for some people that certain words and characters were reserved for boolean logic, so now you are required to use double quotes ("") to use logical operators in the filter box, otherwise it will simply try to match the whole string.
For example, to filter for both words "one" and "two", you should now write your query the following way:
"one" and "two"
Note that more advanced syntax is now available, and you can create your queries from the GUI using the magnifying glass at the top of the database tree. Refer to the following tutorial page for more information: https://neuroimage.usc.edu/brainstorm/Tutorials/PipelineEditor#Search_Database
This is a new feature so let us know if some things are not clear in the tutorial or if you have suggestions for improvement.
I hope this helps!
Martin