Perhaps you should try some spelling variations:
"trinh toan nham snippets" » "tinh toan nham snippets", "thanh toan nham snippets", "trinh han nham snippets", "trinh toan nha snippets", "trinh toan ham snippets", "trinh hoang nham snippets", "trinh toan nham slippers"
"dung cac code snippets" » "luong cac code snippets", "dung cho code snippets", "dung tai code snippets", "dung cac cong snippets", "dung cac co snippets", "dung cac che snippets", "dung cac 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 nham snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh toan nham snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
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