Perhaps you should try some spelling variations:
trinh cao » trinh chao, trinh co, trinh cau
hoc viet » hoc hien
soi viet » hoi viet, oi viet, doi viet
trinh do » trinh ky
cao bang » cao tang, cao nang, co ban
cac cac » cac cach, ca cac, cac bac
bang va » hang va, ban va, trang va
cac tay » cac cay, cac tac, cac tai
lanh va » hanh va, anh va, lanh dao
do lanh » do sanh, do danh, do anh
dang va » dang van, dang vat, hang va
cac cam » cad cam, cac cap, cac cau
cac co » cac cong
tay co » ty co, cay co, tay o
co soi » cot soi, co so, co hoi
cam lo » nam lo, cam ly, cam o
lo soi » lo so, mo soi

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) OR (hoc viet)) nam ) or ((( cong trinh cao bang va cac tay co soi viet nam ) or ( chuong trinh cao dang va cac cam lo soi 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) OR (hoc viet)) nam ) OR ((( cong trinh cao bang va cac tay co soi viet nam ) OR ( chuong trinh cao dang va cac cam lo soi 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) OR (hoc viet)) nam ) or ((( cong trinh cao bang va cac tay co soi viet nam ) or ( chuong trinh cao dang va cac cam lo soi viet nam ))))".
• Adding a wildcard symbol may retrieve word variants: (( chuong trinh do lanh va cac cac co ((so viet) OR (hoc viet)) nam ) or ((( cong trinh cao bang va cac tay co soi viet nam ) or ( chuong trinh cao dang va cac cam lo soi viet nam ))))*.