Perhaps you should try some spelling variations:
"parsing expression using diffusion problem" » "cloning expression using diffusion problem" (Expand search), "parsing expression using diffusion process" (Expand search), "parsing expression during diffusion problem" (Expand search), "parsing expression and diffusion problem" (Expand search)
"using coding python python programming" » "using codigo python python programming" (Expand search), "using codigos python python programming" (Expand search), "using using python python programming" (Expand search), "using coding pythons python programming" (Expand search), "using coding piton python programming" (Expand search), "using coding pitons python programming" (Expand search), "using coping python python programming" (Expand search), "using coating python python programming" (Expand search), "using cooking 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: (("parsing expression using diffusion problem") OR ("using coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"parsing expression using diffusion problem\") OR (\"using coding python python programming\"))".
• Removing quotes may allow a broader search: (( parsing expression using diffusion problem ) OR ( using coding python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("parsing expression using diffusion problem") OR ("using coding python python programming"))*.