Perhaps you should try some spelling variations:
double eyelid » double eye
double ended » double sided, double entry
double folio » double folding, double fusion, double folded
double eged » double edge, double eye, double ridged
helix » felix

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: the ((((double helix) OR (((double eyelid) OR (((((double eged) OR (double edged))) OR (double ended))))))) OR (double folio)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "the ((((double helix) or (((double eyelid) or (((((double eged) OR (double edged))) or (double ended))))))) or (double folio))".
• Adding a wildcard symbol may retrieve word variants: the ((((double helix) or (((double eyelid) or (((((double eged) OR (double edged))) or (double ended))))))) or (double folio))*.