Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
trinh toan » tinh toan, thanh toan, trinh han
trinh cua » trinh luat, trinh quan, trinh luan
ho chieu » theo chieu, hoc thieu, doi chieu
tinh cua » sinh cua, tinh chat, tranh cua
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 chi) OR (ho chieu)) xanh - hanh ((trinh cua) OR (tinh cua)) nhung cong trinh toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chi) or (ho chieu)) xanh - hanh ((trinh cua) OR (tinh cua)) nhung cong trinh toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((doi chi) or (ho chieu)) xanh - hanh ((trinh cua) OR (tinh cua)) nhung cong trinh toan cau*.