Perhaps you should try some spelling variations:
"line segmental features analysis" » "line segment features analysis", "line segment feature analysis", "line segments feature analysis", "line segmental feature analysis", "line segmental measures analysis", "liver segmental features analysis", "line segments features analysis"
"line segmental nature analysis" » "line segmental signatures analysis", "line segmental anatomy analysis", "line segment feature analysis", "line segmental capture analysis", "line segmental feature analysis", "line segmental natural analysis", "liver segmental nature analysis", "line segments nature analysis", "line segment nature analysis"
"line segmental motor analysis" » "liver segmental motor analysis", "line segments motor analysis", "line segment motor analysis", "line segmental motion analysis", "line segmental odor analysis", "line segmental color analysis"

Try widening your search to All Fields.

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