Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cong hoa o2 snippets" » "dong hoa o2 snippets", "dong hoc o2 snippets", "hang hoa o2 snippets", "cong hoa o snippets", "cong hoa 2 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: (((("cong hoa o2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong hoa o2 snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong hoa o2 snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong hoa o2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.