Perhaps you should try some spelling variations:
"dong yan zhang slippers" » "dong yang zhang slippers", "dong ban hang slippers", "dong van khang slippers", "dong san zhang slippers", "dong ban zhang slippers", "dong yan zhang slippery", "dong yan 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: (((("dong yan 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: (((("dong yan zhang slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong yan zhang slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong yan zhang slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.