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 » so viet, oi viet, doi viet
cac dang » cac dan, cac cong, cac van
hoi viet » hai viet, oi viet, thai viet
dang vat » dang van, dong vat, dang nhat
cot soi » cot loi, cong soi
cay cot » cay coc, cac cot, cay cat
cua cay » cua cac
vat cua » mat cua, bat cua, dat cua
vat ca » vat va, tat ca, vat da
ca cay » cac cay, ca cac, ca cao
cay co » cac co, tay co, cay cong
co hoi » co hoc, co loi
co van » cao van, so van, do van
may co » tay co, lay co, may do

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