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"
"trinh tin code snippets" » "trinh kinh code snippets", "trinh toan code snippets", "trinh tu code snippets", "trinh tin co snippets", "trinh tin 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: (((("trinh tin 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: (((("trinh tin code snippets") OR ("dung nhung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh tin code snippets ) or ( dung nhung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh tin code snippets") or ("dung nhung code snippets"))) or ("locating bug code snippets"))*.