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