Perhaps you should try some spelling variations:
"experiments search algorithm" » "experiments approach algorithm" (Expand Search)
"level coding algorithm" » "level cosine algorithm" (Expand Search), "level colony algorithm" (Expand Search), "level scheduling algorithm" (Expand Search)
"element both algorithms" » "elements 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: (((("element both algorithms") OR ("experiments search algorithm"))) OR ("level coding algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"element both algorithms\") OR (\"experiments search algorithm\"))) OR (\"level coding algorithm\"))".
• Removing quotes may allow a broader search: (((( element both algorithms ) OR ( experiments search algorithm ))) OR ( level coding algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("element both algorithms") OR ("experiments search algorithm"))) OR ("level coding algorithm"))*.