Perhaps you should try some spelling variations:
"dung trung java snippets" » "dung trong java snippets", "quang trung java snippets", "truong trung java snippets", "dung trung va snippets", "dung trinh java snippets", "dung trung java slippers"
"using _ code snippets" » "using _ code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code 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: (((("using _ code snippets") or ("dung trung java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using _ code snippets") OR ("dung trung java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using _ code snippets ) or ( dung trung java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using _ code snippets") or ("dung trung java snippets"))) or ("locating bug code snippets"))*.