Perhaps you should try some spelling variations:
"trinh cau hanh snippets" » "trinh chat hanh snippets", "trinh chao hanh snippets", "trinh tu hanh snippets", "trinh cau danh snippets", "trinh cau lanh snippets", "trinh cuu hanh snippets", "trinh cau hanh slippers"
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets", "dung dung 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 cau hanh snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("trinh cau hanh snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.