Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung dai » truong dai, truong dao, trung tam
dung cong » dung trong
tung dap » tung dan, tuong dan, tuong dao
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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 ((hieu manh) OR (chieu sach)) - manh ((tung dap) OR (trung dai)) dung cong dan toan cau~.
• Adding a wildcard symbol may retrieve word variants: doi ((hieu manh) or (chieu sach)) - manh ((tung dap) or (trung dai)) dung cong dan toan cau*.