Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thu dang » thu hang, thu bang, thu dong
su sach » so sach, vu sach
hanh di » hanh vi, hanh de, hang di
tuc van » thuc van, truc van, tuc va
dau tuc » dau tu, dao tuc, cau truc
xay hoi » xa hoi, tay hoi, cay phoi
su dang » su dung
tu dang » tu dong, vu dang, tu dan
cua tre » cua te, cuu tre, cua triet
va dau » va dao
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((((tu dang) OR (su dang))) or (thu dang)) xay hoi. lieu va dau tuc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((((tu dang) OR (su dang))) OR (thu dang)) xay hoi. lieu va dau tuc van hanh di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((((tu dang) OR (su dang))) or (thu dang)) xay hoi. lieu va dau tuc van hanh di cua tre*".