Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
doc sac » doc sach, dac sac, hoc sach
va danh » va dinh, va dan, dia danh
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, ban hanh
lam xuc » cam xuc, lam duoc
van lam » van nam
cao hoi » co hoi, cao hoc, tao hoi
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sac ky nang ((cao hoi) OR (cau hoi)). hieu van lam xuc ((va danh) or (va hanh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sac ky nang ((cao hoi) OR (cau hoi)). hieu van lam xuc ((va danh) OR (va hanh)) hai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sac ky nang ((cao hoi) OR (cau hoi)). hieu van lam xuc ((va danh) or (va hanh)) hai cua tre*".