Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tran xuan de snippets" » "tran quang de snippets", "tran van de snippets", "tran xuan du snippets", "tran luan de snippets", "tran xuan dien 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: (((("tran xuan de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tran xuan de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tran xuan de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tran xuan de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.