Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
va tham » van tham, va cham, va thanh
hanh di » hanh vi, hanh de, hang di
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
loc va » luc va
di cua » dai cua, doi cua, de cua
x hoi » o hoi, x ho, 5 hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach v nang ((x hoi) OR (xa hoi)). lieu va tham ((hoc va) or (loc va)) hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach v nang ((x hoi) OR (xa hoi)). lieu va tham ((hoc va) OR (loc va)) hanh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach v nang ((x hoi) OR (xa hoi)). lieu va tham ((hoc va) or (loc va)) hanh di cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach v nang ((x hoi) OR (xa hoi)). lieu va tham ((hoc va) or (loc va)) hanh di cua triet*.