Despite these positive aspects, the major drawback of this approach to search
is that the effectiveness depends entirely on the user. Because of the lack of a sophisticated
ranking algorithm, simple queries will not work well. All documents
containing the specified query words will be retrieved, and this retrieved set will
be presented to the user in some order, such as by publication date, that has little
to do with relevance. It is possible to construct complex Boolean queries that
narrow the retrieved set to mostly relevant documents, but this is a difficult task that requires considerable experience.