Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
doc hieu » toc thieu, hoc thieu, hoc hien
trung va » truong va, trang va, trung tam
trung ha » trung hoc, trung tam, trung cap
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 ha)) nhung cong dan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu manh - thanh ((trung va) OR (trung ha)) nhung cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - thanh ((trung va) OR (trung ha)) nhung cong dan toan cao*.