Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh chao » trinh chat, trinh han, trinh co
trinh cau » trinh chat, trinh tu, trinh han
trinh dao » trinh do, trinh da, trinh dan
hoi viet » hai viet, thai viet, cuoi viet
soi viet » so viet, doi viet, noi viet
dao hanh » dao thanh, dang hanh, ban hanh
can cau » van cau, ban cau, cac cau
oi viet » o viet, cuoi viet, gioi viet
hanh va » hang va, hanh vi
ca cau » cac cau, cua cau, ca cac
lan va » luan va, lanh va, lan van
cay co » cac co, tay co, cay cong
tay o » tay co

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 dao hanh va ((ca cau) OR (can cau)) co ((hoi viet) or (oi viet)) nam ) or ( chuong ((trinh cau) or (trinh chao)) lan va cac ((tay o) or (cay co)) soi viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong trinh dao hanh va ((ca cau) OR (can cau)) co ((hoi viet) OR (oi viet)) nam ) OR ( chuong ((trinh cau) OR (trinh chao)) lan va cac ((tay o) OR (cay co)) soi viet nam )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong trinh dao hanh va ((ca cau) OR (can cau)) co ((hoi viet) or (oi viet)) nam ) or ( chuong ((trinh cau) or (trinh chao)) lan va cac ((tay o) or (cay co)) soi viet nam ))".
• Adding a wildcard symbol may retrieve word variants: (( chuong trinh dao hanh va ((ca cau) OR (can cau)) co ((hoi viet) or (oi viet)) nam ) or ( chuong ((trinh cau) or (trinh chao)) lan va cac ((tay o) or (cay co)) soi viet nam ))*.