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", "size segment structure analysis"
"pipe segment structure analysis" » "pipe segment structural analysis", "pipe segmental structure analysis", "pipe sediment structure analysis", "pipe pigment structure analysis", "pipe segments structure analysis", "line segment structure analysis", "five segment structure analysis"
"life segment testing analysis" » "life segment learning analysis", "life sediment testing analysis", "life pigment testing analysis", "life cement testing analysis", "line segment testing analysis", "five segment testing analysis", "size segment testing analysis", "life segment treesing analysis", "life segment treeing analysis"
"life segment test analysis" » "life segment cost analysis", "life segment blot analysis", "life segment content analysis", "line segment test analysis", "five segment test analysis", "size segment test analysis", "life segment trees analysis", "life segment tree analysis"

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