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 in program" » "_ convolutional codes in program" (Expand search), "_ convolutional code in program" (Expand search), "_ convolutional long in program" (Expand search), "_ convolutional coding in programs" (Expand search), "_ convolutional coding rna program" (Expand search), "_ convolutional coding and program" (Expand search), "_ convolutional coding _ 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 in program\") OR (\"performance optimization python python programming\"))~".
• Removing quotes may allow a broader search: (( _ convolutional coding in program ) OR ( performance optimization python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("_ convolutional coding in program") OR ("performance optimization python python programming"))*.