Perhaps you should try some spelling variations:
"dung trinh java slippers" » "dung tinh java slippers", "dong trinh java slippers", "cong trinh java slippers", "dung trinh java slippery", "dung trinh java grippers"
"dung he code snippets" » "dung cho code snippets", "dung he core snippets"
"locating bug code snippets" » "locating bug core 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 trinh java slippers") or ("dung he code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung trinh java slippers") OR ("dung he code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung trinh java slippers ) or ( dung he code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung trinh java slippers") or ("dung he code snippets"))) or ("locating bug code snippets"))*.