Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"qua dau toan snippets" » "qua dan toan snippets", "qua dang toan snippets", "qua dau tranh snippets", "qua da toan snippets", "qua bau 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 dau 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 dau toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( qua dau toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("qua dau toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.