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