Perhaps you should try some spelling variations:
"specular surfaces" » "molecular surfaces", "regular surfaces", "irregular surfaces"
"singular surfaces" » "singular spaces", "modular surfaces"
"stellar surfaces" » "stellar surface", "steel surfaces", "cell surfaces"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("specular surfaces") OR ("stellar surfaces"))) OR ("singular surfaces")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"specular surfaces\") OR (\"stellar surfaces\"))) or (\"singular surfaces\"))".
• Removing quotes may allow a broader search: (((( specular surfaces ) OR ( stellar surfaces ))) or ( singular surfaces )).
• Adding a wildcard symbol may retrieve word variants: (((("specular surfaces") OR ("stellar surfaces"))) or ("singular surfaces"))*.