Perhaps you should try some spelling variations:
thuc day » thuc dan
danh vai » danh sai, danh va, doanh van
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang co » nang cao, nang doc, nang noi
hieu va » lieu va, hieu qua
co loi » co hoi
vai va » mai va, dai va, hai va
va am » va lam, va cam

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang co loi. hieu va am ((thuc vat) OR (thuc day)) danh vai va triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang co loi. hieu va am ((thuc vat) OR (thuc day)) danh vai va triet*.