Perhaps you should try some spelling variations:
"dung sach cau snippets" » "duong sach cau snippets", "dung sai cau snippets", "dung cac cau snippets", "dung sach cap snippets", "dung sach dau snippets", "dung sach mau snippets"
"dung bug code snippets" » "dung dung code snippets", "dung hung code snippets", "dung rung code snippets", "dung bug core snippets"
"locating bug code snippets" » "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: (((("dung bug code snippets") or ("dung sach cau snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung bug code snippets") OR ("dung sach cau snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung bug code snippets ) or ( dung sach cau snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung bug code snippets") or ("dung sach cau snippets"))) or ("locating bug code snippets"))*.