Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
ban thanh » ban hanh, ban hang
van pham » san pham, van phan, van phat
sach thu » sach thue, sach thieu, sach tham
thuc ban » thuoc ban, thuc dan, thu ban
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
xang xa » mang xa, ang xa, dang xay
de cua » le cua, dieu cua
te cua » tue cua, le 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 thu ((xang xa) OR (lang xa)) hoi. hieu van pham thuc ban thanh ((de cua) OR (te cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu ((xang xa) or (lang xa)) hoi. hieu van pham thuc ban thanh ((de cua) OR (te cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: su sach thu ((xang xa) or (lang xa)) hoi. hieu van pham thuc ban thanh ((de cua) OR (te cua)) tre*.