Perhaps you should try some spelling variations:
gia doanh » gia thanh, gia dinh, giai doan
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
van lam » van nam
lam duc » lam duoc, pham duc, nam duoc
duc gia » quoc gia
tai cua » thai cua, tai cuc, tri cua

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 ky ((nang ma) OR (sang ma)) hoa. hieu van lam duc gia doanh tai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang ma) OR (sang ma)) hoa. hieu van lam duc gia doanh tai cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang ma) OR (sang ma)) hoa. hieu van lam duc gia doanh tai cua triet*.