Perhaps you should try some spelling variations:
"trinh cua nhan snippets" » "tinh cua nhan snippets", "trinh luat nhan snippets", "trinh quan nhan snippets", "trinh ca nhan snippets", "trinh cua ngan snippets", "trinh cua nha snippets", "trinh cua nhan slippers"
"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", "dung dung code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

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