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