Perhaps you should try some spelling variations:
"trinh cua ly snippets" » "tinh cua ly snippets", "trinh luat ly snippets", "trinh quan ly snippets", "trinh cua ky snippets", "trinh cua le snippets", "trinh cua ty snippets", "trinh cua ly 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 cua ly 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 cua ly snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh cua ly snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.