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