Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh cao » trinh chao, trinh co, trinh cau
hai viet » thai viet, tai viet, dai viet
cac cong » cua cong
thi viet » thi lien
via cua » gia cua, gian cua, giau cua
van via » van va, van gia, van vi
cao van » cac van, dao van, cao dang
van cau » van dau, van hau, van chat
van ca » van cua, dan ca, van ha
cay co » cac co, tay co, cay cong
co thi » cao thi, co thai, do thi

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