Perhaps you should try some spelling variations:
segmental signatures » elemental signatures, elemental signature, dental signatures
segment features » element features, recent features, treatment features
segment feature » segments feature, segmental features, salient feature

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: line ((((segment feature) OR (((segment features) OR (salient features))))) OR (segmental signatures)) analysis.
• The words AND, OR and NOT may confuse the search; try adding quotes: "line ((((segment feature) or (((segment features) OR (salient features))))) or (segmental signatures)) analysis".
• Adding a wildcard symbol may retrieve word variants: line ((((segment feature) or (((segment features) OR (salient features))))) or (segmental signatures)) analysis*.