Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hat do toan snippets" » "hat do tuan snippets", "hat so toan snippets", "hat bao toan snippets", "hat doi toan snippets", "hat dao toan snippets", "hat de 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 do 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 do toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hat do toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hat do toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.