Perhaps you should try some spelling variations:
"trinh doanh thu snippets" » "trinh danh thu snippets", "kinh doanh thu snippets", "chinh doanh thu snippets", "trinh doanh tai snippets", "trinh doanh thu 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 doanh thu 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 doanh thu snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh doanh thu snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.