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