Perhaps you should try some spelling variations:
"dung duc dung snippets" » "dung duc hung snippets", "dung duc cuong snippets", "dung duc phung snippets", "duong duc dung snippets", "dang duc dung snippets", "dung du dung snippets", "dung duc dung slippers"
"using a code snippets" » "using a core snippets", "using a code slippers"
"locating bug code snippets" » "locating bug core snippets", "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("using a code snippets") or ("dung duc dung snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using a code snippets") OR ("dung duc dung snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using a code snippets ) or ( dung duc dung snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using a code snippets") or ("dung duc dung snippets"))) or ("locating bug code snippets"))*.