Perhaps you should try some spelling variations:
"dung toan ngan slippers" » "dung doanh ngan slippers", "dung thang ngan slippers", "dung thanh ngan slippers", "dung tai ngan slippers", "dung toan ban slippers", "dung toan nha slippers", "dung toan ngan slippery", "dung toan ngan 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.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung toan ngan 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 toan ngan slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung toan ngan slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung toan ngan slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.