If your search returns a large number of jobs, you can try the following:
Examine the text links in the left column to refine your search. Click those that fit what you are looking for, which will return a subset of your original search results.
Alternatively, try adding more terms to the what box and search again. Also, don't forget to use the where box - using just your postcode works well.
Another great tip: exclude jobs containing certain keywords. Just type the word NOT before any terms you don't want. For example: contract NOT lawyer