Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
mang cua » manh cua, dung cua, ban cua
dang xay » dang van, van xay
ban hanh » ban hang
thuc ban » thuoc ban, thuc dan, thu ban
cau thuc » cau truc, cuu thuc, can thuc
sach thu » sach thue, sach thieu, sach tham
hanh di » hanh vi, hanh de, hang di
tu sach » thu sach, su sach, te sach
thi lan » thi hanh, thi nang, thi lien
thi van » thi hanh, thi nang
di cau » da cau, diem cau

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: tu sach thu ((mang cua) OR (dang xay)) hoi. ((thi van) OR (thi lan)) cau thuc ban hanh di cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu ((mang cua) or (dang xay)) hoi. ((thi van) OR (thi lan)) cau thuc ban hanh di cau tren~".
• Adding a wildcard symbol may retrieve word variants: tu sach thu ((mang cua) or (dang xay)) hoi. ((thi van) OR (thi lan)) cau thuc ban hanh di cau tren*.