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