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