Perhaps you should try some spelling variations:
"trinh cac trieu snippets" » "trinh cau trieu snippets", "trinh chat trieu snippets", "trinh chao trieu snippets", "trinh cac tieu snippets", "trinh cac kieu snippets", "trinh cac trieu slippers"
"dung ung code snippets" » "dung trung code snippets", "dung quang code snippets", "dung chung code snippets", "dung ung co snippets", "dung ung 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 cac trieu snippets") or ("dung ung code snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("trinh cac trieu snippets") or ("dung ung code snippets"))) or ("locating bug code snippets"))*.