Perhaps you should try some spelling variations:
"trinh van lich snippets" » "trinh han lich snippets", "trinh quan lich snippets", "trinh toan lich snippets", "trinh van dich snippets", "trinh van linh snippets", "trinh vat lich snippets", "trinh van lich 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"

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("trinh van lich 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 van lich snippets") OR ("dung bug code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh van lich snippets ) or ( dung bug code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh van lich snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))*.