Perhaps you should try some spelling variations:
"resourcesssssssssssssssssssssssssssss detection functions" » "resourcesssssssssssssssssssssssssssss detection function" (Expand Search)
"sources selection functions" » "sources selection function" (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: (("resourcesssssssssssssssssssssssssssss detection functions") OR ("sources selection functions"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"resourcesssssssssssssssssssssssssssss detection functions\") OR (\"sources selection functions\"))*".
• Removing quotes may allow a broader search: (( resourcesssssssssssssssssssssssssssss detection functions ) OR ( sources selection functions ))*.