Perhaps you should try some spelling variations:
"trinh dan thuc snippets" » "trinh han thuc snippets", "trinh van thuc snippets", "trinh san thuc snippets", "trinh dan toc snippets", "trinh am thuc snippets", "trinh dan thuc slippers"
"dung cho code snippets" » "dung cho cong snippets", "dung cfd code snippets", "dung cho con snippets", "dung 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: (((("trinh dan thuc snippets") or ("dung cho code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh dan thuc snippets") OR ("dung cho code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh dan thuc snippets ) or ( dung cho code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh dan thuc snippets") or ("dung cho code snippets"))) or ("locating bug code snippets"))*.