Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
bac trung » ba trung, dac trung, bao trung
cac trung » cac truong, dac trung, cao trung
van nang » van quang, van ban, van dong
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
su sach » so sach, vu sach
v nang » va nang, vu nang, voi nang
di cua » dai cua, doi cua, de cua

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 ((v nang) or (van nang)) xa hoi. hieu qua ((cac trung) OR (bac trung)) va hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((v nang) OR (van nang)) xa hoi. hieu qua ((cac trung) OR (bac trung)) va hanh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((v nang) or (van nang)) xa hoi. hieu qua ((cac trung) OR (bac trung)) va hanh di cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) or (van nang)) xa hoi. hieu qua ((cac trung) OR (bac trung)) va hanh di cua triet*.