Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh cao » trinh chao, trinh co, trinh cau
thai viet » thi viet, tai viet, tai vien
mai viet » thi viet
cac cong » cua cong
hai viet » tai viet, dai viet, han viet
van cau » van dau, van hau, van chat
van via » van va, van gia, van giao
cay co » cac co, cay cong
tay co » ty co, tay o
van vi » van vu, gan vi, van ai
van ca » van cua, dan ca, van ha

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: (( chuong trinh cao ((van via) OR (van vi)) cua cac cong ((hai viet) OR (mai viet)) nam ) OR ( chuong trinh cao ((van ca) OR (van cau)) cua ((cay co) OR (tay co)) thai viet nam ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong trinh cao ((van via) OR (van vi)) cua cac cong ((hai viet) or (mai viet)) nam ) or ( chuong trinh cao ((van ca) or (van cau)) cua ((cay co) or (tay co)) thai viet nam ))~".
• Adding a wildcard symbol may retrieve word variants: (( chuong trinh cao ((van via) OR (van vi)) cua cac cong ((hai viet) or (mai viet)) nam ) or ( chuong trinh cao ((van ca) or (van cau)) cua ((cay co) or (tay co)) thai viet nam ))*.