Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
dan vat » dang vat, van vat, dan va
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
nang co » nang cao, nang doc, nang noi
dan vai » dan va, dan tai, den vai
co loi » co hoi
va am » va lam, va cam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang co loi. hieu va am thuc va ((dan vai) OR (dan vat)) ((cua triet) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang co loi. hieu va am thuc va ((dan vai) OR (dan vat)) ((cua triet) or (va triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang co loi. hieu va am thuc va ((dan vai) OR (dan vat)) ((cua triet) or (va triet))*.