Perhaps you should try some spelling variations:
"structural conditions" » "structural transitions", "structural considerations", "structural control"
"structural functional" » "structure function"
"structural functions" » "structures functions", "structural foundations", "structure function"
"structure functions" » "structure function"

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: (((((("structural functions") OR ("structural conditions"))) OR ("structure functions"))) OR ("structural functional")).
• Removing quotes may allow a broader search: (((((( structural functions ) or ( structural conditions ))) or ( structure functions ))) or ( structural functional )).
• Adding a wildcard symbol may retrieve word variants: (((((("structural functions") or ("structural conditions"))) or ("structure functions"))) or ("structural functional"))*.