Perhaps you should try some spelling variations:
"hoc trinh java snippets" » "doc trinh java snippets", "hoc tinh java snippets", "hoc sinh java snippets"
"dong cong che snippets" » "duong cong che snippets", "dung cong che snippets", "dang cong che snippets", "dong cong cho snippets", "dong cong chi snippets", "dong cong chu snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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: (((("hoc trinh java snippets") or ("dong cong che snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hoc trinh java snippets") OR ("dong cong che snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoc trinh java snippets ) or ( dong cong che snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoc trinh java snippets") or ("dong cong che snippets"))) or ("locating bug code snippets"))*.