Perhaps you should try some spelling variations:
nhanh lang » nhanh quang, nhanh thang, nhan dang
hieu manh » chieu xanh, hieu nganh, dieu hanh
lang luan » tang luan, hang luan, bang luan
cong cong » cong dong, trong cong, dang cong
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
dan toan » van toan, dan than, manh toan
van tuan » van quan, van ban, anh tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu manh - nhanh lang luan ((cong cong) or (dung cong)) ((dan toan) or (van tuan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - nhanh lang luan ((cong cong) OR (dung cong)) ((dan toan) OR (van tuan)) cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - nhanh lang luan ((cong cong) or (dung cong)) ((dan toan) or (van tuan)) cau*.