Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
thai tuc » thai thuc, thai thuy, thai hoc
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
hac tuc » thac toc
vai cua » dai cua, hai cua, lai cua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
su sac » su cac, su xac

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 sach)) ky lang xa hoi. hieu van ((hac tuc) 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 sach)) ky lang xa hoi. hieu van ((hac tuc) 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 sach)) ky lang xa hoi. hieu van ((hac tuc) or (thai tuc)) ban hanh vai cua tre*".