Perhaps you should try some spelling variations:
thac toc » cac toc, thac cac, thi toc
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
cua tre » cua te, cuu tre, cua triet
vai cua » dai cua, hai cua, lai cua
hac tuc » thai tuc
hieu va » lieu va, hieu qua
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
su sac » su sach, su cac, su xac

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((ky lang) OR (ky dang)) xa hoi. hieu va ((hac tuc) OR (thac toc)) ban hanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((ky lang) or (ky dang)) xa hoi. hieu va ((hac tuc) OR (thac toc)) ban hanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sac ((ky lang) or (ky dang)) xa hoi. hieu va ((hac tuc) OR (thac toc)) ban hanh vai cua tre*.