Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dung danh qua slippers" » "dung doanh qua slippers", "dung dan qua slippers", "dung dang qua slippers", "dung hanh qua slippers", "dung doanh quan slippers", "dung manh quan slippers", "dung danh qua slippery", "dung danh qua 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 danh qua 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 danh qua slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( dung danh qua slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dung danh qua slippers"))) or ("locating bug code snippets"))*.