Perhaps you should try some spelling variations:
"dan hoc cuon snippets" » "dan hoc code snippets", "dan hoc con snippets", "dan hoc chuong snippets", "dan hoc luong snippets", "van hoc cuon snippets", "dan toc cuon snippets", "dai hoc cuon snippets"
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"

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 ("dan hoc cuon snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("dan hoc cuon snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( dan hoc cuon snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("dan hoc cuon snippets"))) or ("locating bug core snippets"))*.