Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
hanh va » hang va, hanh vi
loc van » luoc van, hoc van, lo van
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, me hoi
va cua » va chua, via cua, ca cua

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: thuat sach ky nang ((ma hoi) OR (ma hoa)). hieu ((ve cam) OR (ve cac)) loc van hanh va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang ((ma hoi) or (ma hoa)). hieu ((ve cam) OR (ve cac)) loc van hanh va cua tre~".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ((ma hoi) or (ma hoa)). hieu ((ve cam) OR (ve cac)) loc van hanh va cua tre*.