Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
lai cua » dai cua, hai cua, lai chau
sach tu » sach thu, cach tu, sach uu
sach ty » sach y, sach thu, xach tay
va dao » ca dao
dao tu » dao tuc, dao tru, tao tu
xang o » lang o, tang o, dang o
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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: toc ((sach ty) OR (sach tu)) xang o hoi. lieu va dao tu ((va hanh) OR (va thanh)) lai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) or (sach tu)) xang o hoi. lieu va dao tu ((va hanh) OR (va thanh)) lai cua te~".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) or (sach tu)) xang o hoi. lieu va dao tu ((va hanh) OR (va thanh)) lai cua te*.