Perhaps you should try some spelling variations:
"performance optimization python python programming" » "performance prediction python python programming" (Expand search), "performance optimization method python programming" (Expand search), "performance optimization option python programming" (Expand search), "performance optimization methods python programming" (Expand search), "performance optimization pythons python programming" (Expand search), "performance optimization piton python programming" (Expand search), "performance optimization pitons python programming" (Expand search)
"_ convolutional coding on program" » "_ convolutional codes on program" (Expand search), "_ convolutional code on program" (Expand search), "_ convolutional long on program" (Expand search), "_ convolutional coding of program" (Expand search), "_ convolutional coding in program" (Expand search), "_ convolutional coding an program" (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: "((\"_ convolutional coding on program\") OR (\"performance optimization python python programming\"))~".
• Removing quotes may allow a broader search: (( _ convolutional coding on program ) OR ( performance optimization python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("_ convolutional coding on program") OR ("performance optimization python python programming"))*.