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