Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dem toi du snippets" » "dem hoi du snippets", "diep toi du snippets", "dem toi uu snippets", "dem tri du snippets", "dem toi da 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: (((("dem toi 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: (((("dem toi du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dem toi du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dem toi du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.