Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc quan den snippets" » "luc quan den snippets", "cuc quan den snippets", "dung quan den snippets", "duc quan doan snippets", "duc quan he snippets", "duc quan doi 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 quan den 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 quan den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc quan den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc quan den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.