Perhaps you should try some spelling variations:
"trinh toan hoang snippets" » "tinh toan hoang snippets", "thanh toan hoang snippets", "trinh han hoang snippets", "trinh tran hoang snippets", "trinh tuan hoang snippets", "trinh hoan hoang snippets", "trinh toan hoang slippers"
"dung cua code snippets" » "dung luan code snippets", "dung cho code snippets", "dung cua cong snippets", "dung cua co snippets", "dung cfd code snippets", "dung cua 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: (((("trinh toan hoang snippets") or ("dung cua code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh toan hoang snippets") OR ("dung cua code snippets"))) OR ("locating bug code snippets")).
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