Perhaps you should try some spelling variations:
"patients sampling algorithm" » "patients scheduling algorithm" (Expand Search)
"element model algorithm" » "element mould algorithm" (Expand Search), "elements model algorithm" (Expand Search)
"sediment cnn algorithm" » "sediment rd algorithm" (Expand Search), "sediment colony algorithm" (Expand Search), "sediment cosine algorithm" (Expand Search)

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("patients sampling algorithm") OR ("sediment cnn algorithm"))) OR ("element model algorithm"))~.
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