Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
cua viet » ca viet, cua vat, cua dieu
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cac duc » cac du, cao duc, cac dac
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di

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 ty nang cau hoi. lieu va cac duc va danh vi ((cua viet) OR (hoa viet))~.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang cau hoi. lieu va cac duc va danh vi ((cua viet) or (hoa viet))*.