Perhaps you should try some spelling variations:
"experiments 1 algorithm" » "experimental _ algorithm" (Expand Search), "experiments _ algorithms" (Expand Search), "experiments rd algorithm" (Expand Search)
"elements tree algorithms" » "elements three algorithms" (Expand Search), "elements free algorithms" (Expand Search)
"neural colony algorithm" » "neural colon 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: (((("experiments 1 algorithm") OR ("elements tree algorithms"))) OR ("neural colony algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"experiments 1 algorithm\") OR (\"elements tree algorithms\"))) OR (\"neural colony algorithm\"))".
• Removing quotes may allow a broader search: (((( experiments 1 algorithm ) OR ( elements tree algorithms ))) OR ( neural colony algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("experiments 1 algorithm") OR ("elements tree algorithms"))) OR ("neural colony algorithm"))*.