Perhaps you should try some spelling variations:
cao hoi » cau hoi, co hoi, cao hoc
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, cuu tre, luy tre
te sac » te sach, te san
te cac » tu cac, te cao, de cac
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
vi luu » vi lua

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) OR (te cac)) ky nang cao hoi. hieu ((ve cam) OR (ve cac)) xuc va hanh vi luu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) OR (te cac)) ky nang cao hoi. hieu ((ve cam) or (ve cac)) xuc va hanh vi luu tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sac) OR (te cac)) ky nang cao hoi. hieu ((ve cam) or (ve cac)) xuc va hanh vi luu tre*.