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