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"
"trong cho code snippets" » "trong tho code snippets", "trong co code snippets", "rong cho code snippets", "trong cho cong snippets", "trong cfd code snippets", "trong cho con snippets", "trong cho 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 nhung code snippets") or ("trong cho code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung nhung code snippets") OR ("trong cho code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung nhung code snippets ) or ( trong cho code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung nhung code snippets") or ("trong cho code snippets"))) or ("locating bug code snippets"))*.