Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cau thuc » cau truc, cuu thuc, can thuc
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
di cua » dai cua, doi cua, de 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: tu sach v nang xa hoi. ((hieu ve) OR (hieu va)) cau thuc ((va hanh) OR (va thanh)) di cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v nang xa hoi. ((hieu ve) or (hieu va)) cau thuc ((va hanh) OR (va thanh)) di cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach v nang xa hoi. ((hieu ve) or (hieu va)) cau thuc ((va hanh) OR (va thanh)) di cua triet*.