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