Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc huy den snippets" » "duc duy den snippets", "duc hue den snippets", "duc quy den snippets", "duc huy dien snippets", "duc thuy den 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 huy 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 huy den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc huy den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc huy den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.