Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"van luc toan snippets" » "van luc code snippets", "van duc toan snippets", "van quoc toan snippets", "van luc tai snippets", "van loc toan snippets", "van lu toan snippets"
"python using java snippets" » "python using data snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("van luc toan snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van luc toan snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( van luc toan snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van luc toan snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.