Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
va hanh » van hanh, va thanh, va danh
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
cua te » cua tu
tu sac » tu sach, tu cac, tu san
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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 sac ky nang ((o hoi) OR (o hai)). hieu ve cam duc va hanh vi ((cua te) OR (cau tren))~.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((o hoi) or (o hai)). hieu ve cam duc va hanh vi ((cua te) or (cau tren))*.