Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"pham luan vo snippets" » "phap luan vo snippets", "pham quang vo snippets", "pham van vo snippets", "pham luan von snippets", "pham luan va snippets", "pham luan ve 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: (((("pham luan vo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("pham luan vo snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( pham luan vo snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("pham luan vo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.