Perhaps you should try some spelling variations:
dobenh nhan » doanh nhan
hieu quang » thieu quang, hieu quan, hieu qua
thong cong » trong cong, tong cong, thong thong
hanh tang » hanh trang, anh tang, hanh mang
cua thong » cua thuong, cua khong, cua tong
toc hieu » toc thieu, doc hieu, hoc thieu
tang cua » mang cua, hang cua, tang luan

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc hieu quang - hanh tang cua thong cong ((benh nhan) or (dobenh nhan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu quang - hanh tang cua thong cong ((benh nhan) OR (dobenh nhan)) cau.
• Adding a wildcard symbol may retrieve word variants: toc hieu quang - hanh tang cua thong cong ((benh nhan) or (dobenh nhan)) cau*.