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