Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
cua viet » ca viet, hoa viet, cua vat
ban hanh » ban hang
duc ban » duc tan, duc van, dua ban
ky danh » ky dang
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
tu sac » tu sach, tu cac, tu san
tay ho » tay co, tay o, tay khao
ky anh » ly anh, ty anh
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ((ky danh) OR (ky anh)) tay ho. hieu ve cac duc ban hanh hai ((cua tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ((ky danh) OR (ky anh)) tay ho. hieu ve cac duc ban hanh hai ((cua tre) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ((ky danh) OR (ky anh)) tay ho. hieu ve cac duc ban hanh hai ((cua tre) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky danh) OR (ky anh)) tay ho. hieu ve cac duc ban hanh hai ((cua tre) or (cua viet))*.