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