Perhaps you should try some spelling variations:
dinh cuu » dinh chi
sach ty » sach y, sach tu, sach thu
dinh cu » dinh chuc, dinh chau, dinh chi
qua ban » cua ban, qua quan
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
xua ban » xuat ban, cua ban, mua ban
va nam » van nam, ha nam, va nay
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 ty nang o hoi. hieu va nam ((xua ban) or (qua ban)) thanh ((dinh cu) OR (dinh cuu)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang o hoi. hieu va nam ((xua ban) OR (qua ban)) thanh ((dinh cu) OR (dinh cuu)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang o hoi. hieu va nam ((xua ban) or (qua ban)) thanh ((dinh cu) OR (dinh cuu)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang o hoi. hieu va nam ((xua ban) or (qua ban)) thanh ((dinh cu) OR (dinh cuu)) triet*.