Perhaps you should try some spelling variations:
dinh viet » ninh viet, danh viet, trinh viet
su triet » su viet, su tien, ve triet
cham hoa » chat hoa, pham hoa, cam hoa
dinh vi » dinh ve, dinh tri, dinh thi
so sach » so sanh, bo sach, co sach
sach ly » sach y, sach lo, sach ty
nang ma » tang ma, sang ma, mang may
va cham » va chat, va tham
hoa va » hoa van, hoa xa, hoa vo

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ly ((nang ma) or (nang cao)) hoi. lieu va cham hoa va ((dinh vi) OR (dinh viet)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly ((nang ma) OR (nang cao)) hoi. lieu va cham hoa va ((dinh vi) OR (dinh viet)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ly ((nang ma) or (nang cao)) hoi. lieu va cham hoa va ((dinh vi) OR (dinh viet)) su triet".
• Adding a wildcard symbol may retrieve word variants: so sach ly ((nang ma) or (nang cao)) hoi. lieu va cham hoa va ((dinh vi) OR (dinh viet)) su triet*.