Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"pham voi da snippets" » "pham vi da snippets", "cham voi da snippets", "pham doi da snippets", "pham voi dac snippets", "pham voi dai snippets", "pham voi dan 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 voi da 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 voi da snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( pham voi da snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("pham voi da snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.