Perhaps you should try some spelling variations:
"dung sach thuc snippets" » "duong sach thuc snippets", "dung sai thuc snippets", "dung cac thuc snippets", "dung cach thuc snippets", "dung sach thu snippets", "dung sach thue snippets", "dung sach thuc slippers"
"dung dat code snippets" » "dung va code snippets", "dung tai code snippets", "dung rate code snippets", "dung dat de snippets", "dung dat 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: (((("dung dat code snippets") or ("dung sach thuc snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung dat code snippets") OR ("dung sach thuc snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung dat code snippets ) or ( dung sach thuc snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung dat code snippets") or ("dung sach thuc snippets"))) or ("locating bug code snippets"))*.