Perhaps you should try some spelling variations:
"level using algorithm" » "level cosine algorithm" (Expand Search), "level fusion algorithm" (Expand Search)
"complement cc3d algorithm" » "complement rd algorithm" (Expand Search), "implement cc3d algorithm" (Expand Search), "complementary cc3d 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.

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

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