Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"day chi toan snippets" » "day khi toan snippets", "day chi thanh snippets", "day bai toan snippets", "day cho toan snippets", "dau chi toan snippets", "day cha 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: (((("day chi 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: (((("day chi toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( day chi toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("day chi toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.