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