Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh cao » trinh chao, trinh co, tinh cao
trinh cau » trinh chat, trinh chao, trinh han
cao luan » cao lan, cao quan, cao xuan
trinh tu » trinh do
hoi viet » hai viet, oi viet, thai viet
cong hoi » cong nhoi, cong hoa, cong hai
cao cong » cac cong, cao dang, cua cong
hoc viet » hoc hien
cau lan » cau lanh, cao lan, sau lan
cua cay » cua cac
van cua » vang cua, ban cua, dan cua
lang va » lang van, hang va, lang ha
lan va » luan va, lanh va, lan van
ca cao » ca dao, cu cao, ca cac
cay co » cac co, tay co, cay cong
va ca » va cac, va cao, va cai

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 luan van cua cay co ((so viet) OR (hoc viet)) nam ) OR ((( chuong trinh cau lan va ca cao cong hoi viet nam ) OR ( chuong ((trinh tu) OR (trinh ky)) lang va ca cao cong hoi viet nam ))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong trinh cao luan van cua cay co ((so viet) or (hoc viet)) nam ) or ((( chuong trinh cau lan va ca cao cong hoi viet nam ) or ( chuong ((trinh tu) OR (trinh ky)) lang va ca cao cong hoi viet nam ))))~".
• Adding a wildcard symbol may retrieve word variants: (( chuong trinh cao luan van cua cay co ((so viet) or (hoc viet)) nam ) or ((( chuong trinh cau lan va ca cao cong hoi viet nam ) or ( chuong ((trinh tu) OR (trinh ky)) lang va ca cao cong hoi viet nam ))))*.