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