Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cua hoc de snippets" » "cua hoi de snippets", "cua thuoc de snippets", "cua nuoc de snippets", "cua hoc he snippets", "cua hoc te snippets", "cua hoc do 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: (((("cua hoc de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cua hoc de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cua hoc de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cua hoc de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.