Perhaps you should try some spelling variations:
diem cau » dieu can
su sach » so sach, vu sach
cao hoc » co hoc, cho hoc, chat hoc
hieu le » hieu ve, hieu he, hieu ly
va danh » va dinh, va dan, va hanh
y nang » ky nang, ly nang, v nang
di cau » da cau
le na » le nam, le va, le ta
na tu » nam tu, nha tu, nao tu

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang cao hoc. hieu le na tu va danh ((di cau) OR (diem cau)) viet~".
• Adding a wildcard symbol may retrieve word variants: su sach y nang cao hoc. hieu le na tu va danh ((di cau) OR (diem cau)) viet*.