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

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