Perhaps you should try some spelling variations:
"trinh toan dau snippets" » "tinh toan dau snippets", "thanh toan dau snippets", "trinh han dau snippets", "trinh toan cau snippets", "trinh toan du snippets", "trinh toan dam snippets", "trinh toan dau slippers"
"dung java java snippets" » "dung va java snippets", "dung java java 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: (((("trinh toan dau snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh toan dau snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh toan dau snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.