Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tra den cong snippets" » "tra dien cong snippets", "tra den dong snippets", "tra len cong snippets", "ra den cong snippets", "thai den cong snippets", "tra danh cong 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: (((("tra den cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tra den cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tra den cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tra den cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.