Perhaps you should try some spelling variations:
"trinh anh doanh snippets" » "trinh hanh doanh snippets", "trinh thanh doanh snippets", "trinh kinh doanh snippets", "trinh anh danh snippets", "trinh doanh doanh snippets", "trinh anh doanh 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"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("trinh anh doanh 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 anh doanh snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh anh doanh snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.