Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"vat van hoan snippets" » "vat van hoang snippets", "vat van hoa snippets", "vat van toan snippets", "vat va hoan snippets", "van van hoan snippets", "vat ran hoan 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 van hoan 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 van hoan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( vat van hoan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("vat van hoan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.