Perhaps you should try some spelling variations:
trinh chao » trinh chat, trinh co, trinh giao
trinh khao » trinh khai, trinh kham, trinh khac
cho doanh » hoa doanh
trinh cho » trinh co, trinh chat, trinh cham
trinh han » trinh quan
khao dang » khao danh, khao dung, cao dang
moi viet » muoi viet, mai viet, moi viec
soi viet » so viet, hoi viet, oi viet
doanh va » doan va, doanh tai, doanh cua
cac cap » cao cap, cac cam, cac cau
bau nam » ban nam, hau nam
bac nam » bac am, ban nam, bac nhat
dang va » dang van, dang vat, hang va
co soi » cot soi, co so, co hoi
cac co » cac cong
cam co » nam co, cay co, lam co
va cad » va cao, va cai, va cau
anh va » hanh va
cap do » cau do
do moi » doi moi

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 chao) or (trinh han)) anh va cad ((cam co) OR (cac co)) soi viet nam ) or ((( cong trinh khao dang va ((bac nam) or (bau nam)) co soi viet nam ) or ( cong trinh cho doanh va cac cap do moi viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong ((trinh chao) OR (trinh han)) anh va cad ((cam co) OR (cac co)) soi viet nam ) OR ((( cong trinh khao dang va ((bac nam) OR (bau nam)) co soi viet nam ) OR ( cong trinh cho doanh va cac cap do moi viet nam ))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong ((trinh chao) or (trinh han)) anh va cad ((cam co) OR (cac co)) soi viet nam ) or ((( cong trinh khao dang va ((bac nam) or (bau nam)) co soi viet nam ) or ( cong trinh cho doanh va cac cap do moi viet nam ))))*".