Perhaps you should try some spelling variations:
"using compression in diffusion problem" » "during compression in diffusion problem" (Expand search), "using compressive in diffusion problem" (Expand search), "locking compression in diffusion problem" (Expand search), "using compression in diffusion process" (Expand search), "using compression and diffusion problem" (Expand search), "using compression of diffusion problem" (Expand search), "using compression _ diffusion problem" (Expand search), "using compression on 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using compression in diffusion problem\") OR (\"using coding python python programming\"))~".
• Removing quotes may allow a broader search: (( using compression in diffusion problem ) OR ( using coding python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("using compression in diffusion problem") OR ("using coding python python programming"))*.