Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
duoc van » duoc va, duoc ban, duoc dan
hanh lai » hanh lam, hanh tai, thanh lap
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
duc van » duc va, duc tan, duc manh
lai cua » dai cua, hai cua, lai chau
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang

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 o lang xa hoi. thien ((van lam) OR (van nam)) ((duoc van) OR (duc van)) hanh lai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach o lang xa hoi. thien ((van lam) or (van nam)) ((duoc van) OR (duc van)) hanh lai cua triet~".
• Adding a wildcard symbol may retrieve word variants: su sach o lang xa hoi. thien ((van lam) or (van nam)) ((duoc van) OR (duc van)) hanh lai cua triet*.