Perhaps you should try some spelling variations:
"implement routing algorithm" » "implement cosine algorithm" (Expand Search), "implemented routing algorithm" (Expand Search), "implementing routing algorithm" (Expand Search)
"level coding algorithm" » "level cosine algorithm" (Expand Search), "level colony algorithm" (Expand Search), "level scheduling algorithm" (Expand Search)
"element te algorithms" » "element _ algorithms" (Expand Search), "element rd algorithm" (Expand Search), "elementi per algorithms" (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 te algorithms"))) OR ("level coding algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"implement routing algorithm\") OR (\"element te algorithms\"))) OR (\"level coding algorithm\"))".
• Removing quotes may allow a broader search: (((( implement routing algorithm ) OR ( element te algorithms ))) OR ( level coding algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("implement routing algorithm") OR ("element te algorithms"))) OR ("level coding algorithm"))*.