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

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 va nam ((thuc vat) 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 va nam ((thuc vat) or (thuc dan)) thanh ve cua tre*.