If you are looking for a Relevance Ranked answer use the Relevance option. This will give you the best ranked results for your search. If you use more than one word in your search you will be given results which contain any of the words.
Wild card searches (*) cannot be performed in relevance node.
Select Newest to see the most recent results. Select Oldest to be given the oldest results.
With Newest and Oldest searches you can use a wilcard option. Simply enter part of a word followed by an asterix - for example 'conv*' will display all results where there is any word staring with 'conv'.
You can also use the '+' and '-' options. For example if you'd like results which include 'Davey' but not 'resign' you would enter +davey -resign