Perhaps you should try some spelling variations:
dang xay » dang van, van xay
phuc van » thuc van, phuc va, chuc van
van hanh » van thanh, ban hanh, van anh
ve triet » va trien, su triet
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, lang van
va phuc » van phuc, va thuc, xa phuc
qua va » quan va, qua van, vua va
vi ve » va ve, gi ve, ve ve

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((lang xa) OR (dang xay)) hoi. hieu qua va phuc van hanh vi ve triet~".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((lang xa) OR (dang xay)) hoi. hieu qua va phuc van hanh vi ve triet*.