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 ung dat snippets" » "dung trung dat snippets", "dung quang dat snippets", "dung chung dat snippets", "dung dung dat snippets", "dung vung dat snippets", "dung cung dat snippets", "dung ung dat 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 cau code snippets") or ("dung ung dat snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("trinh cau code snippets") or ("dung ung dat snippets"))) or ("locating bug code snippets"))*.