Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh quan
theo chieu » theo tieu, ho chieu, thi chieu
dung cong » dung trong
trinh han » trinh quan
theo chu » cho chu, chao chu, theo yeu
hanh han » hanh nhan, hanh phan, hanh san
cua dung » cua dang, cua dong, qua dung
han cua » hang cua, nhan cua, than cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (theo chu)) xanh - hanh han cua dung cong ((trinh toan) OR (trinh han)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo chu)) xanh - hanh han cua dung cong ((trinh toan) OR (trinh han)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (theo chu)) xanh - hanh han cua dung cong ((trinh toan) OR (trinh han)) cao".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo chu)) xanh - hanh han cua dung cong ((trinh toan) OR (trinh han)) cao*.