Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
va danh » va dinh, va dan, va hanh
su sach » so sach
vu sach » vu bach, vu khach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa
va tai » va tac, va tap
v nang » va nang, vu nang, van nang
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

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