Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
trinh van » trinh han, trinh quan, trinh toan
thi hieu » thi chieu, thi hien, thi dieu
trinh va » trinh vat, trinh ve, trinh vi
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: ((theo tieu) OR (thi hieu)) xanh - hanh ((trinh va) OR (trinh van)) nhung cong dan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo tieu) or (thi hieu)) xanh - hanh ((trinh va) OR (trinh van)) nhung cong dan toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((theo tieu) or (thi hieu)) xanh - hanh ((trinh va) OR (trinh van)) nhung cong dan toan cau*.