Perhaps you should try some spelling variations:
trinh phuong » trinh duong, trinh dung, trinh cong
phuong cong » phuong dong, phong cong, phung cong
trinh toan » tinh toan, thanh toan, trinh han
doi chinh » do chinh, tai chinh, hoc chinh
anh quang » anh xquang, nhanh quang, tinh quang
hoi viet » hai viet, oi viet, thai viet
anh quan » anh tuan, ban quan, anh nhan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chinh) or (hoi viet)) tach - ((anh quang) OR (anh quan)) trinh phuong cong trinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chinh) OR (hoi viet)) tach - ((anh quang) OR (anh quan)) trinh phuong cong trinh toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chinh) or (hoi viet)) tach - ((anh quang) OR (anh quan)) trinh phuong cong trinh toan cau*".