Perhaps you should try some spelling variations:
dinh tri » chinh tri
cuu tre » cua tre, cau tren, cau treo
danh vi » hanh vi, dinh vi, danh di
cua va » cua vat, chua va, cua van
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
va nam » van nam, ha nam
nang o » nang co, nang ho, nang ro
va nay » va ngay, va cay
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang o hoi. hieu ((va nam) or (va nay)) cua va ((danh vi) or (dinh tri)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang o hoi. hieu ((va nam) OR (va nay)) cua va ((danh vi) OR (dinh tri)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang o hoi. hieu ((va nam) or (va nay)) cua va ((danh vi) or (dinh tri)) cuu tre*.