Perhaps you should try some spelling variations:
"life segmental structure analysis" » "life mental structure analysis", "life skeletal structure analysis", "life metal structure analysis", "life segmental structural analysis", "liver segmental structure analysis", "large segmental structure analysis", "five segmental structure analysis", "pipe segmental structure analysis", "size segmental structure analysis"
"life segment structure analysis" » "life segment structural analysis", "life sediment structure analysis", "life pigment structure analysis", "life argument structure analysis", "five segment structure analysis", "pipe segment structure analysis", "size segment structure analysis"
"line segment cost analysis" » "line segment content analysis", "line segments cost analysis", "line segment case analysis", "line segment across analysis", "line segmental post analysis"

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