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