Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach thu » sach thue, sach thieu, sach tham
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
tu sach » thu sach, su sach, te sach
nang xa » lang xa, nang ma, mang xa
ve cau » va cau, ve cac, le cau
ke cau » ket cau
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: tu sach thu ((nang xa) OR (nang x)) hoi. hieu ((ve cau) OR (ke cau)) truc va hanh vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu ((nang xa) or (nang x)) hoi. hieu ((ve cau) OR (ke cau)) truc va hanh vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach thu ((nang xa) or (nang x)) hoi. hieu ((ve cau) OR (ke cau)) truc va hanh vi cua triet*.