Advanced Search — Use this search option to create search queries using field tags and set combinations. Each search term must be prefaced by a field tag, and search terms must be joined by Boolean operators.

In the first example, we are searching for records on pollution and biosensors and found 388 records. In the second example, we have combined our first search with our second search (sets #1 and #2) to create set #3, which has only 64 records.