Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"pham ky toan snippets" » "pham duy toan snippets", "pham xay toan snippets", "pham ke toan snippets", "pham ly toan snippets", "pham huy toan 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 ky toan 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 ky toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( pham ky toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("pham ky toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.