Perhaps you should try some spelling variations:
"trinh cac nhan slippers" » "trinh cau nhan slippers", "trinh chat nhan slippers", "trinh chao nhan slippers", "trinh ca nhan slippers", "trinh cac nha slippers", "trinh cam nhan slippers", "trinh cac nhan slippery", "trinh cac nhan grippers"
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets"

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("trinh cac nhan slippers") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh cac nhan slippers") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh cac nhan slippers") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.