Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
van tai » von tai, van tuan
hanh di » hanh vi, hanh de, hang di
hanh ve » hanh vi, hanh va, hanh kem
su viet » so viet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
cuc va » chuc va, duc va, cuu va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach v nang x hoi. hieu van tai cuc va ((hanh di) or (hanh ve)) su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang x hoi. hieu van tai cuc va ((hanh di) OR (hanh ve)) su viet*.