If you enter two or more search terms, the search results will return documents with all of those terms.
If your search produces a large number of results, you may want to refine your search terms (Example: performance chemicals instead of chemicals)
Try similar words and word variations (Example: textile instead of fabric, color instead of colour)
You can abbreviate words with * for more results (Example: chem* will find pages with chemical, chemist, chemistry, etc.)