Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tung duy son snippets" » "luong duy son snippets", "quang duy son snippets", "vuong duy son snippets", "tung duy nong snippets", "tung duy sang 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: (((("tung duy 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: (((("tung duy son snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tung duy son snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tung duy son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.