Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
cam thuc » am thuc, nam thuc, can thuc
sach luu » sach uu, sach luan, sach dau
hieu van » hieu va, thien van, lieu va
lang xa » lang ha, dang xay, lang van
dang xa » dang xay, dang ha, dang va
cam thu » nam thu, cac thu, ca thu
su sach » so sach, vu sach
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 luu ((dang xa) or (lang xa)) hoi. hieu van ((cam thuc) or (cam thu)) van hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach luu ((dang xa) OR (lang xa)) hoi. hieu van ((cam thuc) OR (cam thu)) van hanh vi cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach luu ((dang xa) or (lang xa)) hoi. hieu van ((cam thuc) or (cam thu)) van hanh vi cua triet*.