Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ve triet » va trien, su triet
cac truc » cau truc, cac tru, cac trung
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
hanh di » hanh vi, hanh de, hang di
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
va nang » van nang, da nang, cam nang
v nang » vu nang, van nang, voi nang
ve cac » va cac, vien cac

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 cac truc van hanh di ((cua triet) or (ve 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 cac truc van hanh di ((cua triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((v nang) OR (va nang)) xa hoi. hieu ve cac truc van hanh di ((cua triet) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) OR (va nang)) xa hoi. hieu ve cac truc van hanh di ((cua triet) or (ve triet))*.