Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"que vi toan snippets" » "que va toan snippets", "que vi than snippets", "que bai toan snippets", "que vo toan snippets", "qua vi toan snippets", "que di 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: (((("que vi 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: (((("que vi toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( que vi toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("que vi toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.