Perhaps you should try some spelling variations:
"trinh tinh xach snippets" » "trinh kinh xach snippets", "trinh tin xach snippets", "trinh dinh xach snippets", "trinh tinh cach snippets", "trinh tinh mach snippets", "trinh trinh mach snippets", "trinh tinh xach 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 tinh xach 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 tinh xach snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh tinh xach snippets ) or ( dung dung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh tinh xach snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.