Perhaps you should try some spelling variations:
"trinh hoang tuan snippets" » "trinh hoan tuan snippets", "minh hoang tuan snippets", "trinh han tuan snippets", "trinh hoang xuan snippets", "trinh hoang tran snippets", "trinh hoang thanh snippets", "trinh hoang tuan 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 hoang tuan snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("trinh hoang tuan snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.