Perhaps you should try some spelling variations:
trinh cham » trinh chat, trinh chao, trinh phan
trinh cay » trinh cau, trinh may, trinh cac
trinh cao » trinh chao, trinh co, trinh cau
trinh han » trinh quan
dai viet » dao viet, tai viet, da viet
hoc viet » hoc hien
mai viet » thi viet
cay doan » cay dan, cay xoan, chan doan
cao cap » cao chat
cac cau » cac mau, bac cau, ca cau
cao anh » cao dang, cao tang, cao bang
cac cap » cac cay, cac tap, sach cap
cac cam » cad cam, cac cay, cac ham
anh va » hanh va
cau co » cau do, cac co, cay co
co dai » co dan, do dai
va cao » va co, va dao, va bao
cap o » cap do, cap 2, cap 1
o mai » o lai, o hai, o tai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( cong trinh cay doan va ((cac cap) OR (cac cam)) co hoc viet nam ) or ((( chuong ((trinh cham) or (trinh han)) anh va cao cap o mai viet nam ) or ( chuong trinh cao anh va cac cau co dai viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong trinh cay doan va ((cac cap) OR (cac cam)) co hoc viet nam ) OR ((( chuong ((trinh cham) OR (trinh han)) anh va cao cap o mai viet nam ) OR ( chuong trinh cao anh va cac cau co dai viet nam )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cong trinh cay doan va ((cac cap) OR (cac cam)) co hoc viet nam ) or ((( chuong ((trinh cham) or (trinh han)) anh va cao cap o mai viet nam ) or ( chuong trinh cao anh va cac cau co dai viet nam ))))".
• Adding a wildcard symbol may retrieve word variants: (( cong trinh cay doan va ((cac cap) OR (cac cam)) co hoc viet nam ) or ((( chuong ((trinh cham) or (trinh han)) anh va cao cap o mai viet nam ) or ( chuong trinh cao anh va cac cau co dai viet nam ))))*.