Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
nang mai » nang ma, nang tai, lang mai
hoc van » hoc dan, hoc va, hoc vat
soc van » oc van, sac van, soc dan
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
su viet » so viet
anh ve » hanh ve, anh va, anh viet
ve su » va 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 thu) OR (sach y)) nang mai hoi. hieu ve cham ((soc van) OR (hoc van)) anh ve su viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) or (sach y)) nang mai hoi. hieu ve cham ((soc van) OR (hoc van)) anh ve su viet~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) or (sach y)) nang mai hoi. hieu ve cham ((soc van) OR (hoc van)) anh ve su viet*.