Perhaps you should try some spelling variations:
"trinh cuu phap snippets" » "trinh cau phap snippets", "trinh cua phap snippets", "trinh chu phap snippets", "trinh cuu phat snippets", "trinh cu phap snippets", "trinh cuu phap 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 cuu phap 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 cuu phap snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh cuu phap snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.