Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doi cuong vo snippets" » "dai cuong vo snippets", "doi tuong vo snippets", "doi cong vo snippets", "doi luong va snippets", "doi duong va snippets", "doi cong va 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: (((("doi cuong vo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doi cuong vo snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doi cuong vo snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doi cuong vo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.