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