Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doi toan ve snippets" » "boi toan ve snippets", "doi tan ve snippets", "doi doanh ve snippets", "doi toan va snippets", "doi toan ke snippets", "doi toan von 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: (((("doi toan ve snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doi toan ve snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doi toan ve snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doi toan ve snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.