Perhaps you should try some spelling variations:
"thanh lieu o snippets" » "thanh liem o snippets", "thanh thieu o snippets", "thanh vien o snippets", "thanh lieu so snippets", "thanh lieu co snippets", "thanh lieu ho snippets"
"python using java snippets" » "python using data 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: (((("thanh lieu o snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thanh lieu o snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thanh lieu o snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thanh lieu o snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.