Perhaps you should try some spelling variations:
"dung nhung code snippets" » "dung chung code snippets", "dung nhan code snippets", "dung trung code snippets", "dung nhung cong snippets", "dung nhung con snippets", "dung nhung code slippers"
"phung van code snippets" » "phung van de snippets", "phung van hoe snippets", "phung van cong snippets", "phuong van code snippets", "chung van code snippets", "phong van code snippets", "phung van 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: (((("phung van code snippets") or ("dung nhung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phung van code snippets") OR ("dung nhung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phung van code snippets ) or ( dung nhung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phung van code snippets") or ("dung nhung code snippets"))) or ("locating bug code snippets"))*.