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