Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
trong quan » thong quan, tong quan, thong quang
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, cong tan, huong dan
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap

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 ((trung tuan) or (trong quan)) nhung cong dan ((toan cau) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - hanh ((trung tuan) OR (trong quan)) nhung cong dan ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu manh - hanh ((trung tuan) or (trong quan)) nhung cong dan ((toan cau) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - hanh ((trung tuan) or (trong quan)) nhung cong dan ((toan cau) OR (toan cao))*.