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