I have now solved the problem, which was created by myself, with the help of Maury at camera bits support.
The trick, with the benefit of hindsight, is very obvious, is to ensure in the search box there are no invisible characters including a return. I now simply press the delete key in the search box, insert the required phrase(s), and search. Make sure you do not hit the return key as this puts in an invisible character.
Thanks again to Camera bits support.