If the titles are not what you would expect, think again about the terms you have used and modify your search accordingly.
A closer look at the indexing terms may indicate that your search could be improved by the addition of some of those terms, either to more precisely focus on the search topic, or to extend it.
Selecting from displayed references a term that aptly describes your topic, should retrieve all those records that otherwise did not match your initial search terms.
Refine your search by combining such new search terms with previous sets where appropriate, or create a whole new sequence of sets. Repeat the procedure until you feel that your search string is satisfactory.
If your records are relevant but too numerous you may be able to reduce the total by limiting by timespan, language, document type or restricting to basic index fields. depending on the host service. Limits can be applied before, during, or after you have used the search command. See the tutorial from CAS.