When searching for a Parent Page in the Copy Page Tree app, you must enter a full word or use a wild card *. Partial word searches do not work.
Example
The destination I want for this example is 'How To Articles'
Partial Word Search
Entering 'h' does not jump to pages beginning with 'h'.
Wild Card Search - 1 Letter
Entering 'h*' (the asterisk is a wildcard) works but may not be the quickest route, depending on your page names. In that case, you may want to try using two or more letters in your wildcard search or entering a full word.
Wild Card Search - 2 Letters
Entering 'ho*' took me straight to what I wanted.
Full Word Search
Entering 'how' gets me what I want, too.
Additional search suggestions: Confluence Search Syntax