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