Use comas between search words.
Search for any of the keywords, across all posts
The words will be searched for in: post titles, content, categories, and tags.
Search for posts that are in any of the listed categories (OR)
For example: “personal, thinking” will match posts with the categories personal-level or critical-thinking.
Search for posts that are in all the listed categories (AND)
For example: “societal, fascism” will match posts that have the categories societal-level and fascism.