Perhaps you should try some spelling variations:
"dang yong zhang slippers" » "dang yang zhang slippers", "dang ying zhang slippers", "dang yong zheng slippers", "dang cong zhang slippers", "dang hoang zhang slippers", "dang cuong zhang slippers", "dang yong zhang slippery", "dang yong 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 ("dang yong 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 ("dang yong zhang slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( dang yong zhang slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dang yong zhang slippers"))) or ("locating bug code snippets"))*.