Perhaps you should try some spelling variations:
"level coding algorithm" » "level cosine algorithm" (Expand Search), "level colony algorithm" (Expand Search), "level scheduling algorithm" (Expand Search)
"complement based algorithm" » "implement based algorithm" (Expand Search), "complementary based algorithm" (Expand Search)
"element tree algorithms" » "elements tree algorithms" (Expand Search), "element three algorithms" (Expand Search), "element free algorithms" (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("complement based algorithm") OR ("element tree algorithms"))) OR ("level coding algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"complement based algorithm\") OR (\"element tree algorithms\"))) OR (\"level coding algorithm\"))*".
• Removing quotes may allow a broader search: (((( complement based algorithm ) OR ( element tree algorithms ))) OR ( level coding algorithm ))*.