Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham tuc » nham thuc, pham thuc, tham thuc
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di 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: ((su sach) OR (toc sach)) ky nang xa hoi. hieu ve cham tuc ((va hanh) OR (van hanh)) vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (toc sach)) ky nang xa hoi. hieu ve cham tuc ((va hanh) OR (van hanh)) vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (toc sach)) ky nang xa hoi. hieu ve cham tuc ((va hanh) OR (van hanh)) vi cua tre*.