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