Perhaps you should try some spelling variations:
dang thanh » dong thanh, dang hanh, hoang thanh
thanh vai » thanh hai, thanh van, thanh tai
cua viet » ca viet, hoa viet, cua vat
hieu hoa » tieu hoa, dieu hoa, hiep hoa
thu dang » thu hang, thu bang, thu dong
vai cua » dai cua, hai cua, lai cua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ha » hieu va, hieu ca, hieu xa
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 ky nang ((x hoi) or (o hoi)). ((hieu ha) OR (hieu hoa)) nam thu dang thanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((x hoi) OR (o hoi)). ((hieu ha) OR (hieu hoa)) nam thu dang thanh vai cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((x hoi) or (o hoi)). ((hieu ha) OR (hieu hoa)) nam thu dang thanh vai cua viet*".