Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
thanh ve » thanh va, thanh vien, thanh van
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
cao hoi » cau hoi, co hoi, cao hoc
hanh ve » hanh vi, hanh va, hanh kem
cua tre » cua te, cuu tre, dua tren
ve nam » he nam, va nam, le nam
cai ky » cao ky, cac ky, cam ky
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. hieu ve nam thuc va ((thanh ve) OR (hanh ve)) ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cai ky nang cao hoi. hieu ve nam thuc va ((thanh ve) OR (hanh ve)) ((cua tre) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: tu cai ky nang cao hoi. hieu ve nam thuc va ((thanh ve) OR (hanh ve)) ((cua tre) or (cua triet))*.