Perhaps you should try some spelling variations:
"trinh cach tieu snippets" » "tinh cach tieu snippets", "trinh cac tieu snippets", "trinh mach tieu snippets", "trinh sach thieu snippets", "trinh cach bien snippets", "trinh cach tu snippets", "trinh cach tieu 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 cach tieu 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 cach tieu snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh cach tieu snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.