Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hang doi » hang di, hang loi, huong doi
truc ban » thuc ban, truc dan, truc van
cac truc » cau truc, cac tru, cac trung
hang oi » hang loi, hang di, hang vi
su sach » vu sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach
v nang » va nang, vu nang, van nang
ve cac » va cac, vien cac

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) OR (so sach)) v nang xa hoi. hieu ve cac truc ban ((hang oi) OR (hang doi)) su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) v nang xa hoi. hieu ve cac truc ban ((hang oi) OR (hang doi)) su triet~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) v nang xa hoi. hieu ve cac truc ban ((hang oi) OR (hang doi)) su triet*.