Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dung hoc phap slippers" » "dong hoc phap slippers", "dung thuoc phap slippers", "trung hoc phap slippers", "dung hoc phan slippers", "dung hoc phat slippers", "dung hoc pho slippers", "dung hoc phap slippery", "dung hoc phap 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 hoc phap 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 hoc phap slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung hoc phap slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung hoc phap slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.