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