Perhaps you should try some spelling variations:
"trinh cac kieu snippets" » "trinh cau kieu snippets", "trinh chat kieu snippets", "trinh chao kieu snippets", "trinh cach tieu snippets", "trinh cac yeu snippets", "trinh tac kiem snippets", "trinh cac kieu 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 cac kieu snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh cac kieu snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh cac kieu snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.