Perhaps you should try some spelling variations:
"tran minh cach snippets" » "tran minh code snippets", "tran dinh cach snippets", "van minh cach snippets", "xuan minh cach snippets", "tran tinh cach snippets", "tran minh cac snippets", "tran minh chanh 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: (((("tran minh cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tran minh cach snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( tran minh cach snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tran minh cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.