Perhaps you should try some spelling variations:
"coder estimation of loading problem" » "model estimation of loading problem" (Expand search), "power estimation of loading problem" (Expand search), "color estimation of loading problem" (Expand search), "coder estimation of routing problem" (Expand search), "coder estimation of planning 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 of loading problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder estimation of loading problem\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder estimation of loading problem ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder estimation of loading problem") OR ("api python python python programming"))*.