Perhaps you should try some spelling variations:
"trinh anh cua snippets" » "trinh hanh cua snippets", "trinh thanh cua snippets", "trinh kinh cua snippets", "trinh manh cua snippets", "trinh canh cua snippets"
"dung cac cong snippets" » "luong cac cong snippets", "dung cho cong snippets", "dung tai cong snippets", "dung cua cong snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("trinh anh cua snippets") or ("dung cac cong snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh anh cua snippets") OR ("dung cac cong snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh anh cua snippets ) or ( dung cac cong snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh anh cua snippets") or ("dung cac cong snippets"))) or ("locating bug code snippets"))*.