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