Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
hanh hai » thanh hai, nhanh hai, hang hai
ky danh » ky anh, ky dang
tay hoi » tay ho, tay thai
cua tre » cua te, cuu tre, cua triet
tao hoi » tao khoi, tao boi, thao hoc
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
tu sac » tu sach, tu cac, tu san
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: tu sac ky danh ((tay hoi) or (tao hoi)). hieu van cam duc ban hanh hai ((cua tre) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky danh ((tay hoi) OR (tao hoi)). hieu van cam duc ban hanh hai ((cua tre) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky danh ((tay hoi) or (tao hoi)). hieu van cam duc ban hanh hai ((cua tre) or (cua vat))*.