Perhaps you should try some spelling variations:
"trinh trinh cau snippets" » "trinh tinh cau snippets", "trinh kinh cau snippets", "trinh tin cau snippets", "trinh trinh chat snippets", "trinh trinh chao snippets", "trinh trinh tu snippets"
"dung cac che snippets" » "luong cac che snippets", "dung cho che snippets", "dung tai che snippets", "dung cac he snippets", "dung cac chien snippets", "dung cac chat 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 trinh cau snippets") or ("dung cac che snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh trinh cau snippets") OR ("dung cac che snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh trinh cau snippets") or ("dung cac che snippets"))) or ("locating bug code snippets"))*.