Perhaps you should try some spelling variations:
"implement routing algorithm" » "implement routine algorithm" (Expand Search), "implement modeling algorithm" (Expand Search), "implement finding algorithm" (Expand Search), "implement making algorithm" (Expand Search)
"element study algorithm" » "element wsindy algorithm" (Expand Search), "element td3 algorithm" (Expand Search), "element seu algorithm" (Expand Search), "relevant study algorithm" (Expand Search), "present study algorithm" (Expand Search), "recent study algorithm" (Expand Search)
"element based algorithm" » "engagement 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: (("implement routing algorithm") OR ((("element based algorithm") OR ("element study algorithm"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"implement routing algorithm\") OR (((\"element based algorithm\") OR (\"element study algorithm\"))))".
• Removing quotes may allow a broader search: (( implement routing algorithm ) OR ((( element based algorithm ) OR ( element study algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("implement routing algorithm") OR ((("element based algorithm") OR ("element study algorithm"))))*.