Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tra hat chau snippets" » "tra ha chau snippets", "tra lai chau snippets", "tra hat nhan snippets", "tra chat chau snippets", "tra hai chau 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 hat chau 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 hat chau snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tra hat chau snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tra hat chau snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.