Perhaps you should try some spelling variations:
dang tao » sang tao, nang tao, vang tao
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
dan vai » dan va, dan tai, dan vat
thuc va » thuc vat, thuc day
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
tao hoi » tao khoi, tao boi, tay hoi
ky dang » ky nang, ky danh
cua tu » cua tuc, cua su, cua cu

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 dang tao hoi. ((hieu ve) OR (hieu va)) cac ((thuc va) OR (thuc dan)) dan vai cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang tao hoi. ((hieu ve) or (hieu va)) cac ((thuc va) OR (thuc dan)) dan vai cua tu~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang tao hoi. ((hieu ve) or (hieu va)) cac ((thuc va) OR (thuc dan)) dan vai cua tu*.