Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh mang » nhanh mang, hanh trang, nhanh lang
cua trung » cua truong, xuan trung, cua nhung
cong tinh » cong trinh, cong vinh, long tinh
luong thi » luong tai
doc hieu » toc thieu, hoc thieu, hoc hien
mang cua » manh cua, dung cua, ban cua

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 - hanh mang cua trung ((cong tinh) or (luong thi)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - hanh mang cua trung ((cong tinh) OR (luong thi)) van ban*.