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

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 cac tuc va doanh cua su 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 cac tuc va doanh cua su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((me hoi) or (ma hoa)). hieu va cac tuc va doanh cua su triet*.