Perhaps you should try some spelling variations:
"dung hai zhang slippers" » "dung hao zhang slippers", "dung hui zhang slippers", "dung hai phong slippers", "dung tai zhang slippers", "dung ha zhang slippers", "dung sai zhang slippers", "dung hai zhang slippery", "dung hai 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 hai 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 hai zhang slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung hai zhang slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung hai zhang slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.