Perhaps you should try some spelling variations:
"trong cau chap snippets" » "trong cau code snippets", "trong cac chap snippets", "trong ca chap snippets", "thong cau chap snippets", "trong cau cham snippets", "trong cau chan snippets", "trong cau phap snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java 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: (((("trong cau chap snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trong cau chap snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( trong cau chap snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trong cau chap snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.