Implement an "Advanced Search" button/capability where more than one thoughts (or fragments of thought names) can be specified. Example:
The Adv Srch form would open with one entry: a search box for entry of text, a dropdown button labeled "relationship" with values of parent|child|jump, and a button with a + to add an additional search entry line. Any number of search entry lines could be added. The default would be "all" logic in that the search would return all thoughts for which all the search entries are true. Perhaps an "any" option could/should be included.