Perhaps you should try some spelling variations:
"level using algorithm" » "level cosine algorithm" (Expand Search), "level fusion algorithm" (Expand Search)
"complement rd algorithm" » "complement _ algorithms" (Expand Search), "implement rd algorithm" (Expand Search), "complementary rd algorithm" (Expand Search)
"element component algorithm" » "elements component algorithm" (Expand Search), "element components 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 rd algorithm") OR ("element component algorithm"))) OR ("level using algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"complement rd algorithm\") OR (\"element component algorithm\"))) OR (\"level using algorithm\"))".
• Removing quotes may allow a broader search: (((( complement rd algorithm ) OR ( element component algorithm ))) OR ( level using algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("complement rd algorithm") OR ("element component algorithm"))) OR ("level using algorithm"))*.