Perhaps you should try some spelling variations:
"dap viet trinh snippets" » "dap viet trung snippets", "dap viet thanh snippets", "dap viet trong snippets", "dao viet trinh snippets", "da viet trinh snippets", "dai viet trinh snippets", "dap viet trinh slippers"
"python using a snippets" » "python using a slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dap viet trinh snippets") or ("python using a snippets"))) or ("locating bug code snippets"))~.
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