Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"phap van son snippets" » "pham van son snippets", "phan van son snippets", "phap han son snippets", "phap van dong snippets", "phap van cong snippets", "phap van sung 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 son 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 son snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phap van son snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phap van son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.