Perhaps you should try some spelling variations:
"line segment features analysis" » "line segment feature analysis", "line segment measures analysis", "line salient features analysis", "line element features analysis", "line recent features analysis", "line segments features analysis"
"pipe segment concept analysis" » "pipe segment content analysis", "pipe cement concept analysis", "pipe segment conceptual analysis", "pipe segments concept analysis", "five segment concept analysis", "size segment concept analysis"

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 features analysis") OR ("pipe segment concept analysis")).
• Removing quotes may allow a broader search: (( line segment features analysis ) or ( pipe segment concept analysis )).
• Adding a wildcard symbol may retrieve word variants: (("line segment features analysis") or ("pipe segment concept analysis"))*.