Perhaps you should try some spelling variations:
thanh dong » thanh duong, thanh cong, hanh dong
ban thanh » ban hanh, ban hang
dong cua » dung cua, cong cua, huong cua
phuc ban » phuc van, thuc ban, thuoc ban
cau phuc » cau truc, chau phu, huu phuc
hieu va » lieu va, hieu qua
so sach » so sanh, bo sach, co sach
vu sach » vu bach, su sach, vu khach
su sac » su sach, su cac, su xac
cua tu » cua tuc, cua su, cua cu
va cau » van cau, va cac, va dau
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 sac) or (((so sach) or (vu sach)))) ky nang o hoi. hieu va cau phuc ban thanh dong cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (((so sach) OR (vu sach)))) ky nang o hoi. hieu va cau phuc ban thanh dong cua tu.
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (((so sach) or (vu sach)))) ky nang o hoi. hieu va cau phuc ban thanh dong cua tu*.