Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"man khoi can snippets" » "mai khoi can snippets", "van khoi can snippets", "dang khoi can snippets", "man khoa can snippets", "man khoi nang snippets", "man hoc can 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: (((("man khoi can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("man khoi can snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("man khoi can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.