Perhaps you should try some spelling variations:
trinh may » trinh ky, trinh han, trinh ly
trinh cau » trinh chat, trinh chao, trinh tu
may doanh » vay doanh, ly doanh, van doanh
cuoi viet » nguoi viet, co viet, nuoc viet
pham hanh » pham thanh, pham anh, pham hang
cau danh » cao danh, chuc danh, nam danh
hai viet » thai viet, mai viet, tai viet
cham anh » pham anh, cham binh, cham tinh
doanh va » doan va, doanh tai, doanh cua
cac cau » cac mau, bac cau, ca cau
danh va » hanh va, anh va, dan va
cac cap » cao cap, cac cam, cac cay
dao cap » cao cap, day cap, dao cac
do cuoi » do choi, dam cuoi, do nguoi
cap do » cau do
co dai » co dan
va dao » ca dao
cap o » cap 2, cap 1, cap 5
o hai » co hai, so hai, o lai

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 may doanh va cac cap do cuoi viet nam ) or ((( chuong trinh ((cham anh) or (pham hanh)) va dao cap o hai viet nam ) or ( chuong trinh cau danh va cac cau ((co dai) OR (do dai)) viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong trinh may doanh va cac cap do cuoi viet nam ) OR ((( chuong trinh ((cham anh) OR (pham hanh)) va dao cap o hai viet nam ) OR ( chuong trinh cau danh va cac cau ((co dai) OR (do dai)) viet nam )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cong trinh may doanh va cac cap do cuoi viet nam ) or ((( chuong trinh ((cham anh) or (pham hanh)) va dao cap o hai viet nam ) or ( chuong trinh cau danh va cac cau ((co dai) OR (do dai)) viet nam ))))".
• Adding a wildcard symbol may retrieve word variants: (( cong trinh may doanh va cac cap do cuoi viet nam ) or ((( chuong trinh ((cham anh) or (pham hanh)) va dao cap o hai viet nam ) or ( chuong trinh cau danh va cac cau ((co dai) OR (do dai)) viet nam ))))*.