Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"vat hoc den snippets" » "van hoc den snippets", "va hoc den snippets", "vat hoc dan snippets", "vat hoc de snippets", "vat hoc hien 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: (((("vat hoc den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("vat hoc den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( vat hoc den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("vat hoc den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.