Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh doi » thanh doi, hanh noi, hang doi
sach thu » sach thue, sach thieu, sach tham
van hanh » van thanh, ban hanh, van anh
doi cua » dai cua, hoi cua
tuc van » thuc van, truc van, tuc va
dau tuc » dau tu, dao tuc, cau truc
sach ty » sach y, sach tu, xach tay
nang xa » lang xa, nang ma, mang xa
va dau » va dao

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 ty) OR (sach thu)) ((nang xa) OR (nang x)) hoi. lieu va dau tuc van hanh doi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach thu)) ((nang xa) OR (nang x)) hoi. lieu va dau tuc van hanh doi cua triet~".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach thu)) ((nang xa) OR (nang x)) hoi. lieu va dau tuc van hanh doi cua triet*.