Perhaps you should try some spelling variations:
"trinh cau code snippets" » "trinh chat code snippets", "trinh chao code snippets", "trinh tu code snippets", "trinh cau cong snippets", "trinh cau de snippets", "trinh cfd code snippets", "trinh cau code slippers"
"dung cua tuc snippets" » "dung luan tuc snippets", "dung cho tuc snippets", "dung cua duc snippets", "dung cua tu snippets", "dung cua thuoc snippets", "dung cua tuc 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 cau code snippets") or ("dung cua tuc snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("trinh cau code snippets") or ("dung cua tuc snippets"))) or ("locating bug code snippets"))*.