Perhaps you should try some spelling variations:
ban danh » ban doanh, ban hanh, ban dan
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
danh vi » hanh vi, dinh vi, danh di
xuc ban » duc ban, cuc ban, quoc ban
nam xuc » cam xuc, nam xua, nam thuc
cua tre » cua te, cuu tre, cua triet
ty hang » ly hang, ty xang, thi hang
ty lang » tay lang, ty xang, tu lang
vi cua » vai cua, di cua
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (vu bach)) ((ty lang) OR (ty hang)) ha hoi. hieu van nam xuc ban danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu bach)) ((ty lang) OR (ty hang)) ha hoi. hieu van nam xuc ban danh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu bach)) ((ty lang) OR (ty hang)) ha hoi. hieu van nam xuc ban danh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu bach)) ((ty lang) OR (ty hang)) ha hoi. hieu van nam xuc ban danh vi cua tre*.