In addition to using date filters and other database filters, here are techniques you can use to create your search terms:
Use keywords in your searching. Select words or phrases which you predict will appear in an article title or description.
Enclose a phrase (a string of 2 or more words) in quotation marks. Example: "heavy equipment".
Truncate (cut off) search terms using an asterisk. The search term: recyc* will retrieve articles which contain any word starting with r-e-c-y-c, like recycle, recycled, recycling, etc.
Combine multiple search concepts using the Boolean terms: AND, OR, NOT
recycling AND biofuel
recycling AND "diesel engines"
recycling AND "construction equipment industry"
sustainability AND "farm equipment"
"intelligent control excavator"