Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duy hue toan snippets" » "duy huu toan snippets", "duy huy toan snippets", "duy hue thanh snippets", "duc hue toan snippets", "duy tue toan 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: (((("duy hue toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duy hue toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duy hue toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duy hue toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.