Perhaps you should try some spelling variations:
"dang dung code snippets" » "dan dung code snippets", "dang hung code snippets", "dang quang code snippets", "dang dung cong snippets", "dang dung co snippets", "dang dung de snippets", "dang dung code slippers"
"dong luc code snippets" » "nang luc code snippets", "dong lbm code snippets", "dong luc cong snippets", "dong luc code slippers"
"locating bug code 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: (((("dang dung code snippets") or ("dong luc code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dang dung code snippets") OR ("dong luc code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dang dung code snippets ) or ( dong luc code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dang dung code snippets") or ("dong luc code snippets"))) or ("locating bug code snippets"))*.