Perhaps you should try some spelling variations:
hong duc » dang duc, ton duc
hanh tai » thanh tai, hang tai, han tai
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
su sach » vu sach
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach
va tuc » va thuc, va tu, va tac

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 sach) OR (so sach)) ky nang xa hoi. hieu van ((va tuc) OR (hong duc)) ban hanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky nang xa hoi. hieu van ((va tuc) or (hong duc)) ban hanh tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky nang xa hoi. hieu van ((va tuc) or (hong duc)) ban hanh tai cua tre*.