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

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 ((loc van) OR (hoc 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 ((loc van) OR (hoc 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 ((loc van) OR (hoc van)) hanh va cua tre*.