Perhaps you should try some spelling variations:
thanh ve » hanh ve, thanh va, thanh vien
thuc dan » thuc hanh, hoc dan, thuc vat
chat hoc » chat hoa, chat thom, cho hoc
thuc va » thuc vat, thuc day
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
cao hoi » cau hoi, co hoi, cao hoc
ve nam » he nam, va nam, le nam
cai ky » cao ky, cac ky, cam ky
ve cua » le cua, de cua, te cua
tu cai » tu cac, tu can, tu bai

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 cai ky nang ((cao hoi) OR (chat hoc)). hieu ve nam ((thuc va) OR (thuc dan)) thanh ve cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cai ky nang ((cao hoi) or (chat hoc)). hieu ve nam ((thuc va) OR (thuc dan)) thanh ve cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu cai ky nang ((cao hoi) or (chat hoc)). hieu ve nam ((thuc va) OR (thuc dan)) thanh ve cua tre*.