Perhaps you should try some spelling variations:
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
ke cau » ket cau
vi cua » vai cua, di cua
luc va » duc va, tuc va, loc va
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ma hoi » mai hoi, ma hoa, me hoi
ve cau » va cau, ve cac, le cau

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: te sac ky nang ((ma hoi) OR (xa hoi)). hieu ((ve cau) OR (ke cau)) luc va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang ((ma hoi) OR (xa hoi)). hieu ((ve cau) or (ke cau)) luc va hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang ((ma hoi) OR (xa hoi)). hieu ((ve cau) or (ke cau)) luc va hanh vi cua tre*.