Perhaps you should try some spelling variations:
"trinh toan lieu snippets" » "tinh toan lieu snippets", "thanh toan lieu snippets", "trinh han lieu snippets", "trinh toan tieu snippets", "trinh thanh lieu snippets", "trinh tai lieu snippets", "trinh toan lieu slippers"
"dung hung code snippets" » "dung chung code snippets", "dung nhung code snippets", "dung huong code snippets", "dung hung 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 toan lieu snippets") or ("dung hung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh toan lieu snippets") OR ("dung hung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh toan lieu snippets ) or ( dung hung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh toan lieu snippets") or ("dung hung code snippets"))) or ("locating bug code snippets"))*.