Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
cac truc » cau truc, cac tru, cac trung
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
su sach » so sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, vu khach
v nang » va nang, vu nang, van 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) OR (vu sach)) v nang xa hoi. hieu ve cac truc va hanh di ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) v nang xa hoi. hieu ve cac truc va hanh di ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) v nang xa hoi. hieu ve cac truc va hanh di ((cua triet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) v nang xa hoi. hieu ve cac truc va hanh di ((cua triet) or (va triet))*.