Perhaps you should try some spelling variations:
doanh cua » doanh luan
va doanh » van doanh, vay doanh, va danh
va triet » va thiet, va trien, 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 nuoc
cac tac » cac toc, cac bac, cac dac
cua va » cua vat, chua va, cua van

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 ((le hoi) or (ma hoa)). hieu va ((cac tuc) or (cac tac)) va doanh cua va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((le hoi) OR (ma hoa)). hieu va ((cac tuc) OR (cac tac)) va doanh cua va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((le hoi) or (ma hoa)). hieu va ((cac tuc) or (cac tac)) va doanh cua va triet*.