Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
danh mai » danh sai, doanh moi, dinh moi
nam truc » nam truoc, nam thuc, nam trung
va danh » va dinh, va dan, va hanh
sach va » sach xa, sach ha, sach dao
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
hieu ve » hieu va, hieu van

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach va ((nang xa) OR (nang ma)) hoi. hieu ve ((cau truc) or (nam truc)) va danh mai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach va ((nang xa) OR (nang ma)) hoi. hieu ve ((cau truc) OR (nam truc)) va danh mai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach va ((nang xa) OR (nang ma)) hoi. hieu ve ((cau truc) or (nam truc)) va danh mai va triet".
• Adding a wildcard symbol may retrieve word variants: su sach va ((nang xa) OR (nang ma)) hoi. hieu ve ((cau truc) or (nam truc)) va danh mai va triet*.