Perhaps you should try some spelling variations:
"trinh cac thoi slippers" » "trinh cau thoi slippers", "trinh chat thoi slippers", "trinh chao thoi slippers", "trinh cac toi slippers", "trinh cac hop slippers", "trinh cac tro slippers", "trinh cac thoi slippery", "trinh cac thoi grippers"
"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"
"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 cac thoi slippers") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh cac thoi slippers") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh cac thoi slippers ) or ( dung cac code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh cac thoi slippers") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.