The search engine used here allows multiple keywords to be used, separated by "and", "or" and "not". Words separated only by blank spaces are treated as if they were separated by "or". Entering the search term "family planning" would be the same as searching for "family OR planning". Is that what you really want? Perhaps searching for "family AND planning" would give better results.
Begin by considering the type of information you're seeking. Try to identify words which might logically be associated with the topic or subject of your search. Some examples of keywords might include:
John Adamson (6/10/95)