Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh cao » trinh chao, trinh co, trinh cau
mai viet » thi viet
hai viet » thai viet, dai viet, han viet
tai viet » thi viet, tai lieu, dao viet
cac cong » cua cong
cao lan » cao van, cao dang, cao tang
ma cua » manh cua, mang cua
va cua » va chua, via cua, da cua
co cua » con cua, cong cua, cuoi cua
co tai » cao tai, co thai, bo tai

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