Perhaps you should try some spelling variations:
cua triet » su triet, va triet
doanh van » doan van, doanh va, doanh ban
cua viet » ca viet, hoa viet, cua vat
va doanh » van doanh, vay doanh, va danh
thuc va » thuc vat, thuc dan, thuc day
sach ky » sac ky, sach y, sach kem
cao hoi » cau hoi, co hoi, cao hoc
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
va am » va lam, va cam

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) OR (sach ty)) nang cao hoi. hieu va am thuc va doanh van ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang cao hoi. hieu va am thuc va doanh van ((cua triet) OR (cua viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach ty)) nang cao hoi. hieu va am thuc va doanh van ((cua triet) or (cua viet))*".