Perhaps you should try some spelling variations:
"dung cacuc code snippets" » "dung cac code snippets", "dung cau code snippets", "dung cacuc core snippets"
"dung sach cua snippets" » "duong sach cua snippets", "dung sai cua snippets", "dung cac cua snippets", "dung cach cua snippets", "dung mach cua snippets", "dung sac cua 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: (((("dung sach cua snippets") or ("dung cacuc code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung sach cua snippets") OR ("dung cacuc code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung sach cua snippets") or ("dung cacuc code snippets"))) or ("locating bug code snippets"))*.