Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach van » sach han, sach va, bach van
van hanh » van thanh, ban hanh, van anh
cam thuc » nam thuc, cam thu, can thuc
hieu van » hieu va, thien van, lieu va
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
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 van ((nang xa) OR (nang ma)) hoi. hieu van ((cam thuc) or (am thuc)) van hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach van ((nang xa) OR (nang ma)) hoi. hieu van ((cam thuc) OR (am thuc)) van hanh vi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach van ((nang xa) OR (nang ma)) hoi. hieu van ((cam thuc) or (am thuc)) van hanh vi cua triet*".