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