Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
chat hoc » chat hoa, chat thom, cho hoc
van lang » van nang, va lang, van hang
hanh ve » hanh vi, hanh va
hoc van » hoc dan, hoc va, hoc vat
su sach » so sach
ve chat » va chat, van chat
lang xa » lang ha, dang xay, lang van
vu sach » vu bach, vu khach
hieu ve » hieu va, hieu van
kem » kiem

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 (vu sach)) van lang xa hoi. hieu ve chat hoc van ((hanh ve) OR (hanh kem)) su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) van lang xa hoi. hieu ve chat hoc van ((hanh ve) OR (hanh kem)) su triet~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) van lang xa hoi. hieu ve chat hoc van ((hanh ve) OR (hanh kem)) su triet*.