Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cam thuc » am thuc, nam thuc, can thuc
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
su dang » su dung
cam thu » nam thu, cac thu, ca thu
vu dang » vu quang, cua dang
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 ((vu dang) OR (su dang)) x ho. 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 ((vu dang) OR (su dang)) x ho. hieu van ((cam thuc) OR (cam thu)) van hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((vu dang) OR (su dang)) x ho. hieu van ((cam thuc) or (cam thu)) van hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((vu dang) OR (su dang)) x ho. hieu van ((cam thuc) or (cam thu)) van hanh vi cua triet*.