Perhaps you should try some spelling variations:
thien van » thi van
van nang » van quang, van ban, van dong
sach van » sach han, sach va, bach van
tu sach » thu sach, su sach, te sach
vuc van » duc van, luc van, thuc van
xuc van » duc van, luc van, xuc ban
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
su bien » su kien, su hien, su tien
ma hoi » mai hoi, xa hoi, ma hoa
vi su » va su, ve su, ki su

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 van nang ma hoi. ((hieu ve) OR (thien van)) cam ((xuc van) OR (vuc van)) hanh vi su bien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach van nang ma hoi. ((hieu ve) or (thien van)) cam ((xuc van) OR (vuc van)) hanh vi su bien~".
• Adding a wildcard symbol may retrieve word variants: tu sach van nang ma hoi. ((hieu ve) or (thien van)) cam ((xuc van) OR (vuc van)) hanh vi su bien*.