Perhaps you should try some spelling variations:
"dung phi thuong snippets" » "dung thi thuong snippets", "dung phan thuong snippets", "dung pham thuong snippets", "dung phu thuong snippets", "xung phi thuong snippets", "dung chi thuong snippets", "dung phi thuong 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 phi thuong 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 phi thuong snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("using a code snippets") or ("dung phi thuong snippets"))) or ("locating bug code snippets"))*.