Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh cao » trinh chao, trinh co, trinh cau
tai lieu » vat lieu
tai viet » thi viet, dao viet
mai viet » thi viet
hai viet » thai viet, dai viet, han viet
cay cong » cac cong, cao cong, cau cong
cua cay » cua cac
luan va » luan van, luat va
cao lan » cao van, cao dang, cao tang
co cua » con cua, cong cua, cuoi cua
cay co » cac co, tay co
lan va » lanh va, lan van, lang va

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