Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"pham viet dk snippets" » "phap viet dk snippets", "pham viet da snippets", "pham viet du snippets", "pham viet duc 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 viet dk 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 viet dk snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( pham viet dk snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("pham viet dk snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.