Perhaps you should try some spelling variations:
"lua dan toan snippets" » "lua dan code snippets", "lua van toan snippets", "lua dan than snippets", "lua manh toan snippets", "luat dan toan snippets", "cua dan toan snippets", "luu dan toan snippets"
"locating bug core snippets" » "locating bug code 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: (((("python using java snippets") or ("lua dan toan snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("lua dan toan snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( lua dan toan snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("lua dan toan snippets"))) or ("locating bug core snippets"))*.