Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"trac hoc dinh slippers" » "toan hoc dinh slippers", "thai hoc dinh slippers", "toc hoc dinh slippers", "trac hoc sinh slippers", "trac hoc kinh slippers", "trac hoc danh slippers", "trac hoc dinh slippery", "trac hoc dinh 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 ("trac hoc dinh slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("trac hoc dinh slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( trac hoc dinh slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("trac hoc dinh slippers"))) or ("locating bug code snippets"))*.