Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
doi chiet » doi chieu, doi viet, doi chinh
trung vap » trung cap, trung van, trung lap
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 cau » toan cao, toan ban, toan tap
doi chi » doi khi

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

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