Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van danh bo snippets" » "van doanh bo snippets", "van anh bo snippets", "van hanh bo snippets", "van dinh bo snippets", "van danh co snippets", "van danh o 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 danh bo 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 danh bo snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van danh bo snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van danh bo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.