Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cam thuc » nam thuc, cam thu, can thuc
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
hang di » hang doi, hang dien, hang dich
hang vi » hang va, hanh vi, khang voi
y nang » ky nang, ly nang, v nang

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