Perhaps you should try some spelling variations:
trinh chao » trinh chat, trinh han, trinh co
trinh dao » trinh da, trinh dan, trinh giao
trinh cau » trinh chat, trinh tu, trinh han
trinh do » trinh ky
soi viet » so viet, hoi viet, oi viet
hanh va » hang va, hanh vi
lan van » luan van, lang van, tan van
ca cau » cac cau, can cau, cua cau
cay co » cac co, tay co, cay cong
lan va » luan va, lanh va, lang va
co hoi » co loi
tay o » tay co
va ca » va cac, va cao, va cai

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 dao) OR (trinh do)) hanh va ca cau ((co hoi) or (co hoc)) viet nam ) or ( chuong ((trinh cau) or (trinh chao)) ((lan va) or (lan van)) cac ((tay o) or (cay co)) soi viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong ((trinh dao) OR (trinh do)) hanh va ca cau ((co hoi) OR (co hoc)) viet nam ) OR ( chuong ((trinh cau) OR (trinh chao)) ((lan va) OR (lan van)) cac ((tay o) OR (cay co)) soi viet nam )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong ((trinh dao) OR (trinh do)) hanh va ca cau ((co hoi) or (co hoc)) viet nam ) or ( chuong ((trinh cau) or (trinh chao)) ((lan va) or (lan van)) cac ((tay o) or (cay co)) soi viet nam ))".
• Adding a wildcard symbol may retrieve word variants: (( chuong ((trinh dao) OR (trinh do)) hanh va ca cau ((co hoi) or (co hoc)) viet nam ) or ( chuong ((trinh cau) or (trinh chao)) ((lan va) or (lan van)) cac ((tay o) or (cay co)) soi viet nam ))*.