Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh cau » trinh chat, trinh chao, trinh tu
hoi viet » hai viet, oi viet, thai viet
tai lieu » vat lieu
tai viet » thi viet, dao viet
mai viet » thi viet
han viet » san viet, van viet, dan viet
via cua » gia cua, gian cua, giau cua
cua cay » cua cac
van via » van va, van gia, van vi
cau van » chau van, cuu van, cac van
van co » van cho, ban co, san co
co cua » con cua, ca cua, cong cua
cay co » cac co, tay co, cay cong

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( chuong trinh cau van via cua ((cac cong) or (cua cong)) ((((hoi viet) or (han viet))) or (mai viet)) nam ) or ( chuong trinh cau van co cua cay co ((tai viet) OR (tai lieu)) nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong trinh cau van via cua ((cac cong) OR (cua cong)) ((((hoi viet) OR (han viet))) OR (mai viet)) nam ) OR ( chuong trinh cau van co cua cay co ((tai viet) OR (tai lieu)) nam ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong trinh cau van via cua ((cac cong) or (cua cong)) ((((hoi viet) or (han viet))) or (mai viet)) nam ) or ( chuong trinh cau van co cua cay co ((tai viet) OR (tai lieu)) nam ))*".