Perhaps you should try some spelling variations:
"spatial modeling algorithm" » "spatial making algorithm" (Expand Search)
"data using algorithms" » "data pacing algorithms" (Expand Search), "data nine algorithms" (Expand Search), "data sorting algorithms" (Expand Search)
"settlement data algorithms" » "settlement art algorithms" (Expand Search), "settlement all algorithms" (Expand Search), "settlement both algorithms" (Expand Search)

Try widening your search to All Fields.

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