Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"mat lam toan snippets" » "mat lam tan snippets", "mat lap toan snippets", "mat tam toan snippets", "dat lam toan snippets", "mat la toan snippets", "mat lai 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: (((("mat lam 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: (((("mat lam toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( mat lam toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("mat lam toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.