Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
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
luc loi » duc loi, luc moi, luc doi
hieu va » hieu qua
thuc va » thuc vat, thuc dan
vai cua » dai cua, hai cua, lai cua

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