Perhaps you should try some spelling variations:
ve triet » va trien, su triet
thanh vi » hanh vi, thanh va, thanh ve
duc van » duc va, duc tan, duc manh
luc van » luoc van, luu van, luc va
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hang ma » hang ca, tang ma, nang ma
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
vi ve » va ve, gi ve, ve ve

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 ty ((hang ma) OR (hang va)) hoi. hieu ve cam ((luc van) OR (duc van)) thanh vi ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((hang ma) or (hang va)) hoi. hieu ve cam ((luc van) OR (duc van)) thanh vi ve triet~".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((hang ma) or (hang va)) hoi. hieu ve cam ((luc van) OR (duc van)) thanh vi ve triet*.