Perhaps you should try some spelling variations:
"_ convolutional code tracing problem" » "_ convolutional codes tracing problem" (Expand search), "_ convolutional and tracing problem" (Expand search), "_ convolucional cnn tracing problem" (Expand search), "_ convolutional code tracking problem" (Expand search), "_ convolutional code tracking problems" (Expand search), "_ convolutional code teaching problem" (Expand search), "_ convolutional cone tracing problem" (Expand search), "_ convolutional model tracing problem" (Expand search)
"active replication python python programming" » "machine replication python python programming" (Expand search), "partial replication python python programming" (Expand search), "active radiation python python programming" (Expand search), "active replication method python programming" (Expand search), "active replication within python programming" (Expand search), "active replication protein python programming" (Expand search), "active replication pythons python programming" (Expand search), "active replication piton python programming" (Expand search), "active replication pitons 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: "((\"_ convolutional code tracing problem\") OR (\"active replication python python programming\"))~".
• Removing quotes may allow a broader search: (( _ convolutional code tracing problem ) OR ( active replication python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("_ convolutional code tracing problem") OR ("active replication python python programming"))*.