Perhaps you should try some spelling variations:
cua triet » cua viet, 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
so sach » so sanh, bo sach, co sach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
nang xa » nang x, lang xa, nang ma
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: so sach vu nang xa hoi. hieu van ((cam thuc) OR (nam thuc)) van hanh vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach vu nang xa hoi. hieu van ((cam thuc) OR (nam thuc)) van hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: so sach vu nang xa hoi. hieu van ((cam thuc) OR (nam thuc)) van hanh vi cua triet*.