Perhaps you should try some spelling variations:
"spatial mapping algorithm" » "spatial modeling algorithm" (Expand Search)
"element both algorithms" » "elements both algorithms" (Expand Search)
"element mould algorithm" » "elements mould algorithm" (Expand Search), "element could algorithm" (Expand Search), "element would algorithm" (Expand Search), "element mold algorithm" (Expand Search)

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("element both algorithms") OR ("element mould algorithm"))) OR ("spatial mapping algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"element both algorithms\") OR (\"element mould algorithm\"))) OR (\"spatial mapping algorithm\"))".
• Removing quotes may allow a broader search: (((( element both algorithms ) OR ( element mould algorithm ))) OR ( spatial mapping algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("element both algorithms") OR ("element mould algorithm"))) OR ("spatial mapping algorithm"))*.