Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su triet » su tien, ve triet
thanh di » thanh doi, thanh de, thanh do
cac quoc » cac nuoc, cac cuoc, cao quoc
van cac » van hac, van cau, van bac
su sach » so sach
vu sach » vu bach, vu khach
su viet » so viet
hanh x » hanh xu, hanh _, hanh y
x hoi » xa hoi, o hoi, x ho
gia » giao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) thuc hanh x hoi. hieu van cac quoc gia thanh di ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) thuc hanh x hoi. hieu van cac quoc gia thanh di ((su triet) OR (su viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) thuc hanh x hoi. hieu van cac quoc gia thanh di ((su triet) OR (su viet))*".