Perhaps you should try some spelling variations:
"trong trinh van snippets" » "trong tinh van snippets", "trang trinh van snippets", "trong thinh van snippets", "trong trinh han snippets", "trong trinh quan snippets", "trong trinh toan snippets", "trong trinh van 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: (((("trong trinh van snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trong trinh van snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trong trinh van snippets ) or ( dung dung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trong trinh van snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.