Perhaps you should try some spelling variations:
"element content algorithm" » "element control algorithm" (Expand Search), "element colony algorithm" (Expand Search), "element cosine algorithm" (Expand Search), "elements content algorithm" (Expand Search)
"level using algorithm" » "level cosine algorithm" (Expand Search), "level fusion algorithm" (Expand Search)
"complement cc3d algorithm" » "complement rd algorithm" (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("element content algorithm") OR ("complement cc3d algorithm"))) OR ("level using algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"element content algorithm\") OR (\"complement cc3d algorithm\"))) OR (\"level using algorithm\"))".
• Removing quotes may allow a broader search: (((( element content algorithm ) OR ( complement cc3d algorithm ))) OR ( level using algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("element content algorithm") OR ("complement cc3d algorithm"))) OR ("level using algorithm"))*.