Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ty hang » ly hang, thi hang, thu hang
cam loc » cam lo
ve cam » ve cham, ve cac, va cam
loc va » hoc va, luc 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 (ty xang)) xa hoi. hieu ve cam loc va hanh di ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (ty xang)) xa hoi. hieu ve cam loc va hanh di ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty hang) OR (ty xang)) xa hoi. hieu ve cam loc va hanh di ((cua triet) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) OR (ty xang)) xa hoi. hieu ve cam loc va hanh di ((cua triet) or (su triet))*.