Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"so vien cho snippets" » "so vien cheo snippets", "so viec cho snippets", "so vien cao snippets", "so viet cho snippets", "so bien cho snippets", "so lien cho 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: (((("so vien cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("so vien cho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( so vien cho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("so vien cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.