Perhaps you should try some spelling variations:
"trinh sang sach snippets" » "trinh san sach snippets", "tinh sang sach snippets", "trinh bang sach snippets", "trinh mang sach snippets", "trinh sang tac snippets", "trinh ban sach snippets", "trinh sang sach slippers"
"dung bug code snippets" » "dung dung code snippets", "dung hung code snippets", "dung rung code snippets", "dung bug code slippers", "dung bug core snippets"
"locating bug code snippets" » "locating bug code slippers", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("trinh sang sach snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh sang sach snippets") OR ("dung bug code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh sang sach snippets ) or ( dung bug code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh sang sach snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))*.