Perhaps you should try some spelling variations:
"dung luat zhang slippers" » "dung luat chung slippers", "dung luat hanh slippers", "dung juan zhang slippers", "dung luan zhang slippers", "dung quat zhang slippers", "dung cua zhang slippers", "dung luat zhang slippery", "dung luat 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 luat 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 luat zhang slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung luat zhang slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung luat zhang slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.