Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cao minh tom snippets" » "chi minh tom snippets", "van minh tom snippets", "cao dinh tom snippets", "cao minh tam snippets", "cao minh tim 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: (((("cao minh tom snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cao minh tom snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cao minh tom snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cao minh tom snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.