Perhaps you should try some spelling variations:
"duong minh dan snippets" » "duong manh dan snippets", "truong minh dan snippets", "thong minh dan snippets", "duong minh danh snippets", "duong minh doan snippets", "duong binh dan snippets", "duong minh dan slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("duong minh dan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duong minh dan snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duong minh dan snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duong minh dan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.