Perhaps you should try some spelling variations:
"trong duoc cac snippets" » "trong cuoc cac snippets", "trong nuoc cac snippets", "trong doi cac snippets", "trong cuoc cach snippets", "trong duoc chat snippets", "trong duong cac snippets"
"dung using java snippets" » "dung ung java snippets", "dung sinh java snippets", "dung uong java snippets", "dung using data 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: (((("trong duoc cac snippets") or ("dung using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trong duoc cac snippets") OR ("dung using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trong duoc cac snippets ) or ( dung using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trong duoc cac snippets") or ("dung using java snippets"))) or ("locating bug code snippets"))*.