Perhaps you should try some spelling variations:
"experiments showed algorithm" » "experiments mould algorithm" (Expand Search)
"level coding algorithm" » "level cosine algorithm" (Expand Search), "level colony algorithm" (Expand Search), "level scheduling algorithm" (Expand Search)
"element based algorithm" » "event based 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 based algorithm") OR ("experiments showed algorithm"))) OR ("level coding algorithm"))~.
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