Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cong luat du snippets" » "cong suat du snippets", "cong luan du snippets", "cuong luan du snippets", "cong luat dau snippets", "cong luat su snippets", "cong luat tu 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 luat du 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 luat du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong luat du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong luat du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.