Perhaps you should try some spelling variations:
"them thanh nam ninh duc." » "thien thanh nam ninh duc.", "thi thanh nam ninh duc.", "pham thanh nam ninh duc.", "them hanh nam ninh duc.", "them thanh tam ninh duc.", "them thanh pham ninh duc.", "them thanh nam dinh duc.", "them thanh nam linh duc.", "them thanh nam hinh duc.", "them thanh nam minh duc.", "them thanh nam tinh duc.", "them thanh nam sinh duoc."
"thep hanh kiem dinh duc." » "thep hinh kiem dinh duc.", "thuc hanh kiem dinh duc.", "thi hanh kiem dinh duc.", "thep khanh kiem dinh duc.", "thep hanh kem dinh duc.", "thep anh kiem dinh duc.", "thep hanh kiem minh duc.", "thep hanh kiem tinh duc.", "thep hanh kiem sinh duoc."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("thep hanh kiem dinh duc.") or ("them thanh nam ninh duc."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("thep hanh kiem dinh duc.") OR ("them thanh nam ninh duc.")).
• Removing quotes may allow a broader search: (( thep hanh kiem dinh duc. ) or ( them thanh nam ninh duc. )).
• Adding a wildcard symbol may retrieve word variants: (("thep hanh kiem dinh duc.") or ("them thanh nam ninh duc."))*.