Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
va thanh » gia thanh, ban thanh, va tinh
cac truc » cau truc, cac tru, cac trung
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va hanh » van hanh, va danh, ban hanh
vu sach » vu bach, vu khach
su sach » so sach
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di 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) or (vu sach)) y nang ma hoi. hieu va cac truc ((va hanh) OR (va thanh)) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang ma hoi. hieu va cac truc ((va hanh) OR (va thanh)) vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) y nang ma hoi. hieu va cac truc ((va hanh) OR (va thanh)) vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y nang ma hoi. hieu va cac truc ((va hanh) OR (va thanh)) vi cua triet*.