Perhaps you should try some spelling variations:
"python missing data snippets" » "python using data snippets"
"co doi co snippets" » "cho doi co snippets", "co dot co snippets", "co dai co snippets", "co doi bo snippets", "co moi co snippets", "co hoi co snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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: "((((\"co doi co snippets\") OR (\"python missing data snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( co doi co snippets ) OR ( python missing data snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("co doi co snippets") OR ("python missing data snippets"))) OR ("locating bug code snippets"))*.