Perhaps you should try some spelling variations:
"trinh han thuc snippets" » "trinh quan thuc snippets", "trinh nhan thuc snippets", "trinh phan thuc snippets", "trinh dan thuc snippets", "trinh han thuc 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"

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