Perhaps you should try some spelling variations:
"hat duc cong snippets" » "hat duc code snippets", "hat duc cuong snippets", "hat dung cong snippets", "hat nuoc cong snippets", "hat dua cong snippets", "hat dum cong snippets", "pham duc cong snippets"
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data 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: (((("python using java snippets") or ("hat duc cong snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("hat duc cong snippets"))) OR ("locating bug core snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("hat duc cong snippets"))) or ("locating bug core snippets"))*.