Perhaps you should try some spelling variations:
doanh cua » doanh luan
cua triet » cua viet, su triet, va triet
va doanh » van doanh, vay doanh, va danh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
cac tuc » cac toc, cac tu, cac tac
cua cua » cua chua, ca cua, qua cua
me hoi » le hoi
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((me hoi) or (ma hoa)). ((hieu va) OR (lieu va)) cac tuc va doanh cua cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((me hoi) OR (ma hoa)). ((hieu va) OR (lieu va)) cac tuc va doanh cua cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((me hoi) or (ma hoa)). ((hieu va) OR (lieu va)) cac tuc va doanh cua cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((me hoi) or (ma hoa)). ((hieu va) OR (lieu va)) cac tuc va doanh cua cua triet*.