Perhaps you should try some spelling variations:
"dung cnnchung code snippets" » "dung chung code snippets", "dung nhung code snippets", "dung cnnchung core snippets", "dung cnnchung code slippers", "dung cnnchuong code snippets", "dung cnncnhung code snippets", "dung cnncchung code snippets"
"hung v code snippets" » "hung v core snippets", "hung v code slippers", "huong v code snippets", "nhung v code snippets", "chung v code snippets"
"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: (((("dung cnnchung code snippets") or ("hung v code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung cnnchung code snippets") OR ("hung v code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung cnnchung code snippets ) or ( hung v code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung cnnchung code snippets") or ("hung v code snippets"))) or ("locating bug code snippets"))*.