Perhaps you should try some spelling variations:
cua triet » su triet, va triet
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, cam thu, can thuc
nam thuc » nam thuoc, am thuc, nam thu
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, co sach
sach va » sach xa, sach ha, sach dao
va nang » van nang, da nang, cam nang
nang xa » nang x, lang xa, nang ma

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach va nang xa hoi. hieu van ((cam thuc) OR (nam thuc)) van hanh vi ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach va nang xa hoi. hieu van ((cam thuc) OR (nam thuc)) van hanh vi ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach va nang xa hoi. hieu van ((cam thuc) OR (nam thuc)) van hanh vi ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: so sach va nang xa hoi. hieu van ((cam thuc) OR (nam thuc)) van hanh vi ((cua triet) or (cua viet))*.