Perhaps you should try some spelling variations:
"coder implementation in covering problem" » "code implementation in covering problem" (Expand search), "decoder implementation in covering problem" (Expand search), "model implementation in covering problem" (Expand search), "coder implementation and covering problem" (Expand search), "coder implementation of covering problem" (Expand search), "coder implementation in routing problem" (Expand search), "coder implementation in loading problem" (Expand search), "coder implementation soil covering problem" (Expand search)
"python coding to python programming" » "action coding to python programming" (Expand search), "python code to python programming" (Expand search), "python acording to python programming" (Expand search), "python decoding to python programming" (Expand search), "python bonding to python programming" (Expand search), "python coding tool python programming" (Expand search), "python coding the python programming" (Expand search), "python coding _ 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 implementation in covering problem") OR ("python coding to python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder implementation in covering problem\") OR (\"python coding to python programming\"))".
• Removing quotes may allow a broader search: (( coder implementation in covering problem ) OR ( python coding to python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder implementation in covering problem") OR ("python coding to python programming"))*.