Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh cac » trinh cau, trinh chat, trinh chao
trinh cao » trinh chao, trinh co, trinh cau
soi viet » oi viet, doi viet, noi viet
trinh do » trinh ky
dang vat » dang van, dong vat, dang nhat
hoi viet » hai viet, oi viet, thai viet
dan vat » dan dat, dan lat, dong vat
so viet » hoc viet
tay coc » tay co, cay coc, tay cac
cua tay » cua cay, cua tam, cua tap
vat cua » mat cua, bat cua, dat cua
van vat » van chat, nhan vat
co hoi » co hoc, co loi
dan va » doan va, dan ca, ban va
ca tay » cam tay, ca cay, ca tai
do van » dao van, vo van, so van

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 do van vat cua tay coc ((soi viet) or (so viet)) nam ) or ((( chuong trinh cao dang vat ((ca tay) or (ha tay)) co hoi viet nam ) or ( chuong trinh cac ((dan vat) OR (dan va)) ((co may) or (co ma)) co hoi viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong trinh do van vat cua tay coc ((soi viet) OR (so viet)) nam ) OR ((( chuong trinh cao dang vat ((ca tay) OR (ha tay)) co hoi viet nam ) OR ( chuong trinh cac ((dan vat) OR (dan va)) ((co may) OR (co ma)) co hoi viet nam )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong trinh do van vat cua tay coc ((soi viet) or (so viet)) nam ) or ((( chuong trinh cao dang vat ((ca tay) or (ha tay)) co hoi viet nam ) or ( chuong trinh cac ((dan vat) OR (dan va)) ((co may) or (co ma)) co hoi viet nam ))))".
• Adding a wildcard symbol may retrieve word variants: (( chuong trinh do van vat cua tay coc ((soi viet) or (so viet)) nam ) or ((( chuong trinh cao dang vat ((ca tay) or (ha tay)) co hoi viet nam ) or ( chuong trinh cac ((dan vat) OR (dan va)) ((co may) or (co ma)) co hoi viet nam ))))*.