Perhaps you should try some spelling variations:
"dung cac trong snippets" » "dung cac truong snippets", "dung cay trong snippets", "dung tac trong snippets", "luong cac trong snippets", "dung cho trong snippets", "dung tai trong snippets", "dung cac trong slippers"
"dung cong code snippets" » "dung trong code snippets", "dung cong cong snippets", "dung cong co snippets", "dung cong che snippets", "dung cong 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: (((("dung cac trong snippets") or ("dung cong code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung cac trong snippets") OR ("dung cong code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung cac trong snippets") or ("dung cong code snippets"))) or ("locating bug code snippets"))*.