Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cam thuc » am thuc, nam thuc, can thuc
sach ky » sac ky, sach y, sach ty
hang di » hang doi, hang vi, hang dien
hanh di » hanh vi, hanh de, danh di
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cam thu » nam thu, cac thu, ca thu

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 ky lang xa hoi. hieu ve ((cam thuc) OR (cam thu)) van ((hanh di) or (hang di)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu ve ((cam thuc) OR (cam thu)) van ((hanh di) OR (hang di)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. hieu ve ((cam thuc) OR (cam thu)) van ((hanh di) or (hang di)) cua triet*".