Perhaps you should try some spelling variations:
trinh chat » tinh chat, trinh luat, trinh han
trinh chao » trinh han, trinh co, trinh giao
huu luat » hieu luat, thue luat, thau luat
cuu luat » cua luat, cuu thuat, quy luat
cay cong » cac cong, cao cong, cau cong
so viet » hoc viet
lanh va » hanh va, anh va, lanh dao
cac tap » cac cap, cac tac, cac tai
cay co » cac co, tay co
ve cac » vien cac

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 chat) or (trinh chao)) lanh va cac ((cay co) OR (cay cong)) so viet nam ) or ( cong trinh ((cuu luat) or (huu luat)) ve cac tap co so viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong ((trinh chat) OR (trinh chao)) lanh va cac ((cay co) OR (cay cong)) so viet nam ) OR ( cong trinh ((cuu luat) OR (huu luat)) ve cac tap co so viet nam )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cong ((trinh chat) or (trinh chao)) lanh va cac ((cay co) OR (cay cong)) so viet nam ) or ( cong trinh ((cuu luat) or (huu luat)) ve cac tap co so viet nam ))".
• Adding a wildcard symbol may retrieve word variants: (( cong ((trinh chat) or (trinh chao)) lanh va cac ((cay co) OR (cay cong)) so viet nam ) or ( cong trinh ((cuu luat) or (huu luat)) ve cac tap co so viet nam ))*.