Perhaps you should try some spelling variations:
"life segment structure analysis" » "life segment structural analysis", "life segmental structure analysis", "life sediment structure analysis", "life pigment structure analysis", "line segment structure analysis", "five segment structure analysis", "pipe segment structure analysis"
"life segment content analysis" » "life segment sentiment analysis", "life segment component analysis", "life segment element analysis", "life cement content analysis", "life pigment content analysis", "life segment concept analysis", "line segment content analysis", "five segment content analysis", "pipe segment content analysis"
"life segment test analysis" » "life segment cost analysis", "life segment testing analysis", "life segment blot analysis", "line segment test analysis", "five segment test analysis", "pipe segment test analysis", "life segment trees analysis", "life segment tree 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 segment structure analysis") OR ((("life segment test analysis") OR ("life segment content analysis")))).
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• Removing quotes may allow a broader search: (( life segment structure analysis ) or ((( life segment test analysis ) OR ( life segment content analysis )))).
• Adding a wildcard symbol may retrieve word variants: (("life segment structure analysis") or ((("life segment test analysis") OR ("life segment content analysis"))))*.