Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hat xam toan snippets" » "hat tam toan snippets", "hat xuan toan snippets", "hat bai toan snippets", "hat dam toan snippets", "chat cam toan snippets", "nhat lam 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: (((("hat xam 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: (((("hat xam toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hat xam toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hat xam toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.