Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
trung cap » truong cao, trung tam
hoc dieu » hoc thieu, hoc hien
hoc tieu » hoc thieu, hoc sieu, hoc tieng
trung va » truong va, trang va, trung ha
cong san » cong tac
san toan » van toan, dan toan, 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: ((hoc dieu) OR (hoc tieu)) tinh - hanh ((trung va) OR (trung cap)) nhung cong san toan cau~.
• Adding a wildcard symbol may retrieve word variants: ((hoc dieu) or (hoc tieu)) tinh - hanh ((trung va) or (trung cap)) nhung cong san toan cau*.