Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung hoc » trung quoc
doc hieu » toc thieu, hoc thieu, hoc hien
trung va » truong va, trang va, trung ha
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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 - thanh ((trung va) or (trung hoc)) nhung cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - thanh ((trung va) OR (trung hoc)) nhung cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - thanh ((trung va) or (trung hoc)) nhung cong dan toan cao*.