Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dinh vai » dinh van, dinh vi, dinh va
hieu cac » hieu luc, hieu va, hieu van
hien cac » thien cac, vien cac, dien cac
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
vu sach » vu bach, su sach, vu khach
va dinh » van dinh, va kinh, va tinh
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, te sach
lao va » tao va, cao va, bao va

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) OR (vu sach)) ky lang xa hoi. hieu ((hien cac) OR (hieu cac)) lao va dinh vai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu sach)) ky lang xa hoi. hieu ((hien cac) OR (hieu cac)) lao va dinh vai cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky lang xa hoi. hieu ((hien cac) OR (hieu cac)) lao va dinh vai cua triet*.