Perhaps you should try some spelling variations:
"coder and coverage optimization problem" » "coder and coverage fertilization problem" (Expand search), "coder and coverage estimation problem" (Expand search), "coder and inverse optimization problem" (Expand search), "coder and coverage optimization problems" (Expand search), "coder and cover optimization problem" (Expand search), "code and coverage optimization problem" (Expand search), "codes and coverage optimization problem" (Expand search), "poder and coverage optimization 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), "rpa python 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 and coverage optimization problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder and coverage optimization problem\") OR (\"api python python python programming\"))*".
• Removing quotes may allow a broader search: (( coder and coverage optimization problem ) OR ( api python python python programming ))*.