Perhaps you should try some spelling variations:
"cong tren cac snippets" » "dong tren cac snippets", "cong ren cac snippets", "rong tren cac snippets", "cong trien cac snippets", "cong tren ca snippets", "cong tren cay snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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