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