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