Perhaps you should try some spelling variations:
"life segmental structure analysis" » "life segment structure analysis", "life mental structure analysis", "life skeletal structure analysis", "life segmental structural analysis", "liver segmental structure analysis", "large segmental structure analysis", "line segmental structure analysis", "five segmental structure analysis", "pipe segmental structure analysis"
"line segmental structure analysis" » "line segment structure analysis", "line mental structure analysis", "line skeletal structure analysis", "line segmental structural analysis", "liver segmental structure analysis", "line segments structure analysis"
"life segment cost analysis" » "life segment content analysis", "line segment cost analysis", "five segment cost analysis", "pipe segment cost analysis", "life segment case analysis", "life segment across analysis", "life segmental post 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: (((("life segmental structure analysis") OR ("line segmental structure analysis"))) OR ("life segment cost analysis")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"life segmental structure analysis\") OR (\"line segmental structure analysis\"))) or (\"life segment cost analysis\"))".
• Removing quotes may allow a broader search: (((( life segmental structure analysis ) OR ( line segmental structure analysis ))) or ( life segment cost analysis )).
• Adding a wildcard symbol may retrieve word variants: (((("life segmental structure analysis") OR ("line segmental structure analysis"))) or ("life segment cost analysis"))*.