Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh cua » manh cua, hang cua, hanh sua
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
va nang » van nang, da nang, cam nang
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
v nang » vu nang, van nang, voi nang
cua va » cua vat, chua va, cua van
ve cam » ve cham, ve cac, ve cai

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 (va nang)) xa hoi. hieu ((ve cam) or (va cam)) luc va hanh cua va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((v nang) OR (va nang)) xa hoi. hieu ((ve cam) OR (va cam)) luc va hanh cua va triet.
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) or (va nang)) xa hoi. hieu ((ve cam) or (va cam)) luc va hanh cua va triet*.