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