Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thi hang » thi hanh, thi nang, thi hong
dinh lai » dinh lam, dinh lap, dinh tai
hieu van » hieu va, thien van, lieu va
van hac » van hoc, van ha, van hai
ty hang » ly hang, ty xang, thu hang
lai cua » dai cua, hai cua, lai chau
su sach » so sach, vu sach
xuc va » tuc va, luc va, xac va

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 ((ty hang) or (thi hang)) xa hoi. hieu van hac ((xuc va) OR (duc va)) dinh lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (thi hang)) xa hoi. hieu van hac ((xuc va) OR (duc va)) dinh lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty hang) or (thi hang)) xa hoi. hieu van hac ((xuc va) OR (duc va)) dinh lai cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) or (thi hang)) xa hoi. hieu van hac ((xuc va) OR (duc va)) dinh lai cua triet*.