Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dung van toa snippets" » "duong van toa snippets", "dung va toa snippets", "dang van toa snippets", "dung van toan snippets", "dung van hoa snippets", "dung van toi 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: (((("dung van toa snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung van toa snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung van toa snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung van toa snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.