Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
trinh toan » tinh toan, thanh toan, trinh han
hinh toan » tinh toan, thanh toan, manh toan
theo chu » theo chieu, cho chu, chao chu
chu xanh » chu manh, chieu xanh, chua xang
nang cua » mang cua, hang cua, tang cua
nang dua » nang du, nang suat, nang quan

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 - ganh ((nang cua) OR (nang dua)) nhung cong ((hinh toan) OR (trinh toan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu xanh - ganh ((nang cua) OR (nang dua)) nhung cong ((hinh toan) or (trinh toan)) cao~".
• Adding a wildcard symbol may retrieve word variants: theo chu xanh - ganh ((nang cua) OR (nang dua)) nhung cong ((hinh toan) or (trinh toan)) cao*.