Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
thuc day » thuc dan, thuc vat
danh vai » danh sai, danh va, doanh van
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan
hieu va » lieu va, hieu qua
nang co » nang cao, nang doc, nang noi
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) OR (thuc day)) danh vai ((cua triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang co loi. hieu va am ((thuc va) or (thuc day)) danh vai ((cua triet) OR (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang co loi. hieu va am ((thuc va) or (thuc day)) danh vai ((cua triet) OR (cua viet))*.