Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh quan » tinh quang, trinh luat
trinh cau » trinh chat, trinh chao, trinh tu
hoi viet » hai viet, oi viet, thai viet
hoc viet » hoc hien
van cac » van hac, van cau, van bac
dan tay » ban tay, dao tay, gian tay
van dan » van ban, ban dan, van dao
cau lan » cau lanh, cao lan, sau lan
cac tay » cac cay, cac tac, cac tai
lan van » luan van, lang van, tan van
tay co » ty co, cay co
san co » ban co, sang cho
cap co » cap cho, tap co, cap do
co hoi » co loi
van co » van cho, ban co, van do
o hoi » o hoc, o hai, o hoa

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