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