Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"dong danh den snippets" » "dong danh code snippets", "dong doanh den snippets", "dong anh den snippets", "cong danh den snippets", "dong danh dien snippets", "dong dan den snippets", "dong danh yen snippets"
"dung java java snippets" » "dung va java 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: (((("dong danh den snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong danh den snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong danh den snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong danh den snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.