Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van tan cham snippets" » "van tam cham snippets", "van trang cham snippets", "van thanh cham snippets", "van tuan cham snippets", "van ban cham snippets", "van tai cham 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 tan cham 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 tan cham snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van tan cham snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van tan cham snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.