Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"van thi cham snippets" » "van thi code snippets", "van thi hai snippets", "van toc cham snippets", "van thi ha snippets", "van tai cham snippets", "dan thi cham snippets", "van thu cham snippets"
"python using java snippets" » "python using data 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 thi cham snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van thi cham snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( van thi cham snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van thi cham snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.