Perhaps you should try some spelling variations:
"dung ngan lan slippers" » "dung nhan lan slippers", "dung luan lan slippers", "dung ngan han slippers", "dung ngan van slippers", "dung ngan can slippers", "dung ngan lan slippery", "dung ngan lan 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 ngan lan slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung ngan lan slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung ngan lan slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung ngan lan slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.