Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh cao » trinh chao, trinh co, trinh cau
hai viet » thai viet, mai viet, tai viet
trinh tu » trinh ky, trinh do
hoi viet » oi viet, thai viet, cuoi viet
caui tay » cau tao, cau xay, canh tay
cao tang » cao dang
cua cay » cua cac
tang va » trang va, tang van, thang va
va caui » va cau, va chuoi
cao lan » cao van, cao dang, cao bang
tu tang » tuc tang, tu trang, tu tong
cai tay » cai tao, cam tay, dai tay
co hai » co dai, o hai, so hai
ca cay » cac cay, ca cac, ca cao
tay co » ty co, cay co, tay o
co hoi » co hoc, co loi
lan va » luan va, lanh va, lan van
va cai » va cac, va bai, va dai

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 cao lan va ((ca cay) OR (cua cay)) co hai viet nam ) or ((( chuong trinh cao tang va caui tay co hoi viet nam ) or ( chuong trinh tu tang va cai tay co hoi viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong trinh cao lan va ((ca cay) OR (cua cay)) co hai viet nam ) OR ((( chuong trinh cao tang va caui tay co hoi viet nam ) OR ( chuong trinh tu tang va cai tay co hoi viet nam ))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong trinh cao lan va ((ca cay) OR (cua cay)) co hai viet nam ) or ((( chuong trinh cao tang va caui tay co hoi viet nam ) or ( chuong trinh tu tang va cai tay co hoi viet nam ))))*".