Required terms
Use a plus sign before each required term.
Example
+automobile +windshield +glass
Excluded terms
Use a minus sign before each excluded term.
Example
+rotary +kiln –cement
Wildcards
Use an asterisk anywhere after the first letter in the term.
Example
auto* will return results for automobile, automatic, autonomous
Exact phrases
Enclose in double quotes.
Example
"basic refractories"