Perhaps you should try some spelling variations:
thai thuc » thai thuy, thai tuc, tham thuc
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hai tuc » thai tuc, hai cuc, hai huoc
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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. hieu van ((hai tuc) OR (thai thuc)) va hanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu van ((hai tuc) OR (thai thuc)) va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu van ((hai tuc) OR (thai thuc)) va hanh vai cua tre*.