Perhaps you should try some spelling variations:
"coder coder crowdsensing _ programming" » "coder or crowdsensing _ programming" (Expand search), "coder moveis crowdsensing _ programming" (Expand search), "coder words crowdsensing _ programming" (Expand search), "coder decoder crowdsensing _ programming" (Expand search), "code code crowdsensing _ programming" (Expand search), "decoder codec crowdsensing _ programming" (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 crowdsensing _ programming") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder crowdsensing _ programming\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder crowdsensing _ programming ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder crowdsensing _ programming") OR ("api python python python programming"))*.