Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"vat phan do snippets" » "va phan do snippets", "van phan do snippets", "sat phan do snippets", "vat phan bo snippets", "vat phan co snippets", "vat phan mo 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 phan do 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 phan do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( vat phan do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("vat phan do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.