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