Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"mat van toan snippets" » "mat van tuan snippets", "mat van tan snippets", "mat van thanh snippets", "ma van toan snippets", "mai van toan snippets", "hat van 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 van 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 van toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( mat van toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("mat van toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.