Perhaps you should try some spelling variations:
"implementing based algorithm" » "implementing system algorithm" (Expand Search), "implementing a algorithm" (Expand Search), "implementing targeted algorithm" (Expand Search)
"level coding algorithm" » "level cosine algorithm" (Expand Search), "level modeling algorithm" (Expand Search), "level finding algorithm" (Expand Search), "level according algorithm" (Expand Search), "level using algorithm" (Expand Search)
"elements best algorithm" » "elements forest algorithm" (Expand Search), "elements new algorithm" (Expand Search), "elements pso algorithm" (Expand Search), "elements res algorithm" (Expand Search), "elements based algorithm" (Expand Search), "elements b algorithm" (Expand Search)

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("implementing based algorithm") OR ("elements best algorithm"))) OR ("level coding algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"implementing based algorithm\") OR (\"elements best algorithm\"))) OR (\"level coding algorithm\"))".
• Removing quotes may allow a broader search: (((( implementing based algorithm ) OR ( elements best algorithm ))) OR ( level coding algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("implementing based algorithm") OR ("elements best algorithm"))) OR ("level coding algorithm"))*.