Perhaps you should try some spelling variations:
"life sediment structure analysis" » "life sedimentary structures analysis", "life document structure analysis", "life argument structure analysis", "life sediment structural analysis", "slide sediment structure analysis", "lake sediment structure analysis", "fine sediment structure analysis"
"line segments case analysis" » "line segments based analysis", "line segment cases analysis", "line segments 10base analysis"
"line segment case analysis" » "line segment cases analysis", "line segment based analysis", "line segment laser 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 sediment structure analysis") OR ((("line segment case analysis") OR ("line segments case analysis")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"life sediment structure analysis\") or (((\"line segment case analysis\") OR (\"line segments case analysis\"))))".
• Removing quotes may allow a broader search: (( life sediment structure analysis ) or ((( line segment case analysis ) OR ( line segments case analysis )))).
• Adding a wildcard symbol may retrieve word variants: (("life sediment structure analysis") or ((("line segment case analysis") OR ("line segments case analysis"))))*.