Perhaps you should try some spelling variations:
trinh cao » trinh chao, trinh cau, tinh cao
trinh co » trinh cong, trinh hoa, trinh ky
dang vat » dang van, dong vat, dang nhat
trinh do » trinh ky
soi viet » hoi viet, oi viet, doi viet
do lanh » do sanh, do danh, do anh
lanh va » hanh va, anh va, lanh dao
cac cam » cad cam, cac cap, cac cau
vat cac » vat cach, sat cac, tat cac
so viet » hoc viet
cac cay » ca cay, cac cap, cac cau
co soi » cot soi, co hoi, co loi
cay co » tay co, cay cong
cac co » cac cong
ca cac » cua cac
va ca » va cao, va cai, va cau
lo so » ly so, li so, lo lo

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 lanh va ca cac co so viet nam ) or ((( cong trinh co ban va cac cay co soi viet nam ) or ( chuong trinh cao dang vat cac cam ((lo so) OR (ho so)) viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong trinh do lanh va ca cac co so viet nam ) OR ((( cong trinh co ban va cac cay co soi viet nam ) OR ( chuong trinh cao dang vat cac cam ((lo so) OR (ho so)) viet nam )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong trinh do lanh va ca cac co so viet nam ) or ((( cong trinh co ban va cac cay co soi viet nam ) or ( chuong trinh cao dang vat cac cam ((lo so) OR (ho so)) viet nam ))))".
• Adding a wildcard symbol may retrieve word variants: (( chuong trinh do lanh va ca cac co so viet nam ) or ((( cong trinh co ban va cac cay co soi viet nam ) or ( chuong trinh cao dang vat cac cam ((lo so) OR (ho so)) viet nam ))))*.