Perhaps you should try some spelling variations:
trinh chao » trinh chat, trinh han, trinh giao
trinh co » trinh do, trinh cong, trinh hoa
cao cay » cao cap, cho cay, ca cay
tao cay » tao cao, tao may, tao cac
cong so » cong san, cong hoa
so viet » hoc viet
luan va » luan van, luat va
lan va » lanh va, lan van, lang va
cac ty » cac ky, cac tu

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 co ban va ((cao cay) OR (tao cay)) cong so viet nam ) or ( cong trinh chao ((lan va) or (luan va)) cac ty co so viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong trinh co ban va ((cao cay) OR (tao cay)) cong so viet nam ) OR ( cong trinh chao ((lan va) OR (luan va)) cac ty co so viet nam ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cong trinh co ban va ((cao cay) OR (tao cay)) cong so viet nam ) or ( cong trinh chao ((lan va) or (luan va)) cac ty co so viet nam ))*".