Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc luc doi snippets" » "duc suc doi snippets", "duc muc doi snippets", "duc quoc doi snippets", "duc luoc doi snippets", "duc lua doi snippets", "duc luc moi snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("duc luc doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duc luc doi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc luc doi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc luc doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.