Perhaps you should try some spelling variations:
"code to precoder same problem" » "code to precoder scheme problem" (Expand search), "code to precoder same problems" (Expand search), "code to precoder some problem" (Expand search), "code to precoder sample problem" (Expand search), "code mimo precoder same problem" (Expand search), "code to precedent same problem" (Expand search)
"api python python python programming" » "api pythons python python programming" (Expand search), "api piton python python programming" (Expand search), "api pitons python python programming" (Expand search), "rpa python 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: "((\"code to precoder same problem\") OR (\"api python python python programming\"))~".
• Removing quotes may allow a broader search: (( code to precoder same problem ) OR ( api python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("code to precoder same problem") OR ("api python python python programming"))*.