Perhaps you should try some spelling variations:
"coder coder community detection problem" » "coder coder community selection problem" (Expand search), "coder coder community prediction problem" (Expand search), "coder coder community collection problem" (Expand search), "coder modern community detection problem" (Expand search), "coder border community detection problem" (Expand search), "coder older community detection problem" (Expand search), "coder decoder community detection problem" (Expand search), "code code community detection problem" (Expand search), "decoder codec community detection problem" (Expand search)
"_ python python python programming" » "_ pythons python python programming" (Expand search), "_ piton python python programming" (Expand search), "_ pitons python python programming" (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: (("coder coder community detection problem") OR ("_ python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder community detection problem\") OR (\"_ python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder community detection problem ) OR ( _ python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder community detection problem") OR ("_ python python python programming"))*.