Perhaps you should try some spelling variations:
"trinh thi tuc snippets" » "trinh tai tuc snippets", "trinh thiet tuc snippets", "trinh tu tuc snippets", "trinh thai tuc snippets", "trinh thi thuc snippets", "trinh thi truc snippets", "trinh thi tuc 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 thi tuc 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 thi tuc snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh thi tuc snippets ) or ( dung dung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh thi tuc snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.