Perhaps you should try some spelling variations:
"coder estimation _ coding problem" » "model estimation _ coding problem" (Expand search), "power estimation _ coding problem" (Expand search), "color estimation _ coding problem" (Expand search), "coder estimation _ coding problems" (Expand search), "coder estimation _ coping problem" (Expand search), "coder estimation _ loading 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 estimation _ coding problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder estimation _ coding problem\") OR (\"api python python python programming\"))*".
• Removing quotes may allow a broader search: (( coder estimation _ coding problem ) OR ( api python python python programming ))*.