Perhaps you should try some spelling variations:
ban hanh » ban hang
cac khoi » cac khoan, cach thoi, hoc khoi
cham cuc » cham cuu, pham cuc, pham chuc
cac thoi » cac toi, cac hop, cac tro
te sach » toc sach
ve cham » va cham, ve chat, vu cham
cuc ban » cua ban, cac ban, cuu ban
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
vi cua » vai cua
di cua » dai cua, doi cua, de 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: te sach ky lang ((cac khoi) OR (cac thoi)). hieu ve cham cuc ban hanh ((vi cua) OR (di cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang ((cac khoi) OR (cac thoi)). hieu ve cham cuc ban hanh ((vi cua) or (di cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang ((cac khoi) OR (cac thoi)). hieu ve cham cuc ban hanh ((vi cua) or (di cua)) tre*.