Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tro van long snippets" » "tro van luong snippets", "tro van dong snippets", "tro van cong snippets", "tho van long snippets", "tao van long snippets", "tro va long 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 van long 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 van long snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tro van long snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tro van long snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.