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