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