Perhaps you should try some spelling variations:
"present routing algorithm" » "present modeling algorithm" (Expand Search), "present finding algorithm" (Expand Search), "present making algorithm" (Expand Search), "present during algorithm" (Expand Search), "present solution algorithm" (Expand Search)
"neural coding algorithm" » "neural cosine algorithm" (Expand Search), "neural modeling algorithm" (Expand Search), "neural finding algorithm" (Expand Search)
"elements rf algorithm" » "elements _ algorithm" (Expand Search), "elements ii algorithm" (Expand Search), "elements art algorithms" (Expand Search), "elements ree algorithm" (Expand Search), "elements res algorithm" (Expand Search)

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