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