Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tran cong du snippets" » "tran hong du snippets", "trien cong du snippets", "tran hoang du snippets", "tran cong dau snippets", "tran cong duc snippets", "tran cong duy 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 cong 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 cong du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tran cong du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tran cong du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.