Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
voi hang » doi khang, thi hang, van hang
dieu cua » dieu tra
va nang » van nang, da nang, cam nang
cac luc » cau luc, coc luc, cac nuoc
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((voi hang) or (va nang)) x hoi. lieu va cac luc ((va danh) or (va hanh)) dieu cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((voi hang) OR (va nang)) x hoi. lieu va cac luc ((va danh) OR (va hanh)) dieu cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach ((voi hang) or (va nang)) x hoi. lieu va cac luc ((va danh) or (va hanh)) dieu cua tre*.