Perhaps you should try some spelling variations:
"coder coder knowledge extraction problem" » "coder coder knowledge construction problem" (Expand search), "coder coder knowledge production problem" (Expand search), "coder coder knowledge creation problem" (Expand search), "coder coder knowledge interaction problem" (Expand search), "coder coder knowledge subtraction problem" (Expand search), "coder coder knowledge extraction probing" (Expand search), "coder code knowledge extraction problem" (Expand search), "coder modern knowledge extraction problem" (Expand search), "coder power knowledge extraction problem" (Expand search), "coder decoder knowledge extraction problem" (Expand search), "code code knowledge extraction problem" (Expand search), "decoder codec knowledge extraction problem" (Expand search)
"api python python python programming" » "api pythons python python programming" (Expand search), "api piton python python programming" (Expand search), "api 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 knowledge extraction problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder knowledge extraction problem\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder knowledge extraction problem ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder knowledge extraction problem") OR ("api python python python programming"))*.