Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van gian mot snippets" » "van giang mot snippets", "dan gian mot snippets", "van giao mot snippets", "van gian o snippets", "van gian co snippets", "van gian dat 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: (((("van gian 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: (((("van gian mot snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van gian mot snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van gian mot snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.