Perhaps you should try some spelling variations:
"hoang tran chap snippets" » "hoang tran code snippets", "hoang tuan chap snippets", "hoang thanh chap snippets", "hoang van chap snippets", "hoang tranh chap snippets", "hoang tran chau snippets", "hoang trang cham 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: (((("hoang tran 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: (((("hoang tran chap snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( hoang tran chap snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoang tran chap snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.