Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dan dung thep slippers" » "dan dung theo slippers", "dan dung thiet slippers", "dan dung he slippers", "van dung thep slippers", "tin dung thep slippers", "ap dung thep slippers", "dan dung thep slippery", "dan dung thep 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 ("dan dung thep slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("dan dung thep slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( dan dung thep slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dan dung thep slippers"))) or ("locating bug code snippets"))*.