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
dang xay » dang van, van xay
thai tuc » thai thuc, thai thuy, thai hoc
hieu van » hieu va, thien van, lieu va
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
su xac » pu xac, su cac
su sac » su sach, su cac

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 (su xac)) ky dang xay hoi. hieu van ((thac toc) or (thai tuc)) ban hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su xac)) ky dang xay hoi. hieu van ((thac toc) OR (thai tuc)) ban hanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) OR (su xac)) ky dang xay hoi. hieu van ((thac toc) or (thai tuc)) ban hanh vai cua tre*".