Perhaps you should try some spelling variations:
trinh cac » trinh cau, trinh chat, trinh chao
thai viet » thi viet, tai viet, mai viet
cac banh » cac benh, cac ban, cac bang
cac hanh » cac thanh, cac hinh, sac hanh
khoe moi » hoc moi
cac cap » cao cap, cac cam, cac cau
hanh va » hang va, hanh vi
so viet » hoc viet
banh va » ban va, anh va, bang va
va cao » va co, va dao, va bao
cac co » cac cong
cap co » cap cho, tap co, cap do

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 cac hanh va cao ((cap co) or (cac co)) so viet nam ) or ((( cong trinh cac banh va cac cap ((cho moi) OR (khoe moi)) viet nam ) or ( cong trinh cac banh va cac ((cap co) or (cac co)) thai viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong trinh cac hanh va cao ((cap co) OR (cac co)) so viet nam ) OR ((( cong trinh cac banh va cac cap ((cho moi) OR (khoe moi)) viet nam ) OR ( cong trinh cac banh va cac ((cap co) OR (cac co)) thai viet nam )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cong trinh cac hanh va cao ((cap co) or (cac co)) so viet nam ) or ((( cong trinh cac banh va cac cap ((cho moi) OR (khoe moi)) viet nam ) or ( cong trinh cac banh va cac ((cap co) or (cac co)) thai viet nam ))))".
• Adding a wildcard symbol may retrieve word variants: (( cong trinh cac hanh va cao ((cap co) or (cac co)) so viet nam ) or ((( cong trinh cac banh va cac cap ((cho moi) OR (khoe moi)) viet nam ) or ( cong trinh cac banh va cac ((cap co) or (cac co)) thai viet nam ))))*.