Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
tu sach » thu sach, su sach, te sach
hanh va » hang va, hanh vi
tuc van » thuc van, truc van, tuc va
sach ty » sach y, sach tu, sach thu
mang xa » lang xa, mang may, mang cua
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
va cua » va chua, via cua, ca 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: tu sach ty ((mang xa) OR (dang xay)) hoi. hieu ((ve cam) OR (va cam)) tuc van hanh va cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((mang xa) OR (dang xay)) hoi. hieu ((ve cam) or (va cam)) tuc van hanh va cua vat~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((mang xa) OR (dang xay)) hoi. hieu ((ve cam) or (va cam)) tuc van hanh va cua vat*.