Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
quoc lan » quoc ban, nuoc luan, quoc quan
van cham » van chat, van tham, va cham
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
tu sach » thu sach, su sach, te sach
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua
tu sac » tu cac, tu san, tu bac

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: ((tu sac) OR (tu sach)) ky tang ma hoi. hieu van cham ((xuc ban) OR (quoc lan)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) OR (tu sach)) ky tang ma hoi. hieu van cham ((xuc ban) or (quoc lan)) hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) OR (tu sach)) ky tang ma hoi. hieu van cham ((xuc ban) or (quoc lan)) hanh vi cua tre*.