Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh han
nhiet nang » nhiet dong, viet nang, nhieu tang
tong cong » trong cong, cong cong, dung cong
chu xanh » chu manh, chieu xanh, chua xang
tang cua » mang cua, tang luan, thong cua
hang cua » mang cua, hang ca, huong cua
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 ((chu xanh) OR (nhiet nang)) - hanh ((tang cua) OR (hang cua)) tong cong trinh toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chu xanh) or (nhiet nang)) - hanh ((tang cua) OR (hang cua)) tong cong trinh toan cau~".
• Adding a wildcard symbol may retrieve word variants: theo ((chu xanh) or (nhiet nang)) - hanh ((tang cua) OR (hang cua)) tong cong trinh toan cau*.