Perhaps you should try some spelling variations:
trinh chao » trinh chat, trinh han, trinh co
trinh cau » trinh chat, trinh tu, trinh han
cuu luat » cua luat, cuu thuat, quy luat
huu luat » hieu luat, thue luat, thau luat
lanh va » hanh va, anh va, lanh dao
cac cay » ca cay, cac cam, cac cap
so viet » hoc viet
cac tap » cac cap, cac tac, cac tai
cay co » cac co, tay co, cay cong
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 cau) or (trinh chao)) lanh va cac cay co 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 cau) OR (trinh chao)) lanh va cac cay co 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 cau) or (trinh chao)) lanh va cac cay co 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 cau) or (trinh chao)) lanh va cac cay co so viet nam ) or ( cong trinh ((cuu luat) OR (huu luat)) ve cac tap co so viet nam ))*.