Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"do tuan cong snippets" » "do thuan cong snippets", "do luan cong snippets", "do tran cong snippets", "do xuan cong snippets", "do quang 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: (((("do tuan 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: (((("do tuan cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( do tuan cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("do tuan cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.