Perhaps you should try some spelling variations:
"trinh toan danh slippers" » "tinh toan danh slippers", "thanh toan danh slippers", "trinh han danh slippers", "trinh toan doanh slippers", "trinh toan anh slippers", "trinh toan hanh slippers", "trinh toan danh slippery", "trinh toan danh grippers"
"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"
"locating bug code snippets" » "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 danh slippers") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh toan danh slippers") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh toan danh slippers ) or ( dung dung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh toan danh slippers") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.