Perhaps you should try some spelling variations:
dinh thai » dinh thi, sinh thai, tinh thai
cau triet » cau trieu, su triet, cua triet
hieu van » hieu va, thien van, lieu va
dau thuc » dan thuc, dai thuc, dam thuc
thai cau » thai cao, toan cau, thai van
su sach » vu sach
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
nang xa » nang x, lang xa, nang ma
van dau » van dao, phan dau
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
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) or (((so sach) OR (co sach)))) y nang xa hoi. hieu van dau thuc va dinh thai cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (((so sach) OR (co sach)))) y nang xa hoi. hieu van dau thuc va dinh thai cau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (((so sach) OR (co sach)))) y nang xa hoi. hieu van dau thuc va dinh thai cau triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (((so sach) OR (co sach)))) y nang xa hoi. hieu van dau thuc va dinh thai cau triet*.