Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
xach tay » canh tay
van hanh » van thanh, ban hanh, van anh
va hanh » va thanh, va danh, ban hanh
mang xa » lang xa, mang may, dang xay
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
du cua » duy cua, dau cua, dum cua
ve cac » va cac, vien cac
cua tu » cua tuc, cua su, cua cu

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: so ((xach tay) OR (sach thu)) mang xa hoi. hieu ve cac luc ((va hanh) OR (van hanh)) du cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((xach tay) or (sach thu)) mang xa hoi. hieu ve cac luc ((va hanh) OR (van hanh)) du cua tu~".
• Adding a wildcard symbol may retrieve word variants: so ((xach tay) or (sach thu)) mang xa hoi. hieu ve cac luc ((va hanh) OR (van hanh)) du cua tu*.