Perhaps you should try some spelling variations:
"dung yang zhang slippers" » "dung yan zhang slippers", "dung cang thang slippers", "dung lang thang slippers", "dung dang zhang slippers", "dung nang zhang slippers", "dong yang zhang slippers", "dung yang zhang slippery", "dung yang zhang grippers"
"dung java java snippets" » "dung 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 yang zhang slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung yang zhang slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung yang zhang slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung yang zhang slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.