Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tro nam cao snippets" » "trot nam cao snippets", "tra nam cao snippets", "trong nam cao snippets", "tro nam sao snippets", "tro nam giao 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: (((("tro nam cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tro nam cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tro nam cao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tro nam cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.