Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"qua van doan snippets" » "qua van doanh snippets", "qua van toan snippets", "qua van hoan snippets", "quan van doan snippets", "qua ban doan snippets", "qua san doan 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 van doan 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 van doan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( qua van doan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("qua van doan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.