After a first search, trying to change the text in the search box results in some unwanted behavior from the search box.
If you select the text with [ctrl]+[a], the text will be selected, then the mega-expando kicks in and will put the cursor after the text.
If you select some letters of the text and start writing, the same thing happens, so if you have written 'ernomy' and want to insert 'go' for 'ergonomy', the result will be 'ergnomyo' (just tried).