Perhaps you should try some spelling variations:
"data preprocessin_ algorithm" » "data processing algorithm" (Expand Search), "data preprocessing algorithm" (Expand Search), "dataset preprocessing algorithm" (Expand Search)
"element mesh algorithm" » "element best algorithm" (Expand Search), "element mean algorithm" (Expand Search), "element means algorithm" (Expand Search), "element method algorithm" (Expand Search), "elements mges algorithm" (Expand Search), "element te algorithm" (Expand Search)
"element gnb algorithm" » "element mnb algorithm" (Expand Search), "element anbs algorithm" (Expand Search), "element cnn algorithm" (Expand Search), "element g 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 mesh algorithm") OR ("element gnb algorithm"))) OR ("data preprocessin_ algorithm"))~.
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