Perhaps you should try some spelling variations:
"trinh hang cac snippets" » "trinh han cac snippets", "tranh hang cac snippets", "trinh hanh cac snippets", "trinh hang ca snippets", "trinh hang cau snippets", "trinh bang cac snippets"
"dung cfd code snippets" » "dung cho code snippets", "dung cua code snippets", "dung co code snippets", "dung cfd core snippets"
"locating bug code snippets" » "locating bug core snippets", "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 hang cac snippets") or ("dung cfd code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh hang cac snippets") OR ("dung cfd code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh hang cac snippets ) or ( dung cfd code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh hang cac snippets") or ("dung cfd code snippets"))) or ("locating bug code snippets"))*.