Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
chat hoc » chat hoa, chat thom, cho hoc
cau tren » cu tren, dau tren, ca tren
ve cham » va cham, ve chat, ve chim
sach ky » sac ky, sach y, sach ty
vu cham » va cham, vu kham, tu cham
cao hoc » co hoc, cho hoc
va hanh » van hanh, va thanh, va danh
hanh ke » hanh kem, thanh ke, hanh ky
xuc va » duc va, tuc va, luc va
ke cau » ket 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: thu sach ky nang ((cao hoc) OR (chat hoc)). hieu ((ve cham) OR (vu cham)) xuc va hanh ke cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((cao hoc) OR (chat hoc)). hieu ((ve cham) or (vu cham)) xuc va hanh ke cau tren~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((cao hoc) OR (chat hoc)). hieu ((ve cham) or (vu cham)) xuc va hanh ke cau tren*.