Perhaps you should try some spelling variations:
ban hanh » ban hang
dia danh » dia ban, gia dinh
van hanh » van thanh, van anh, van ban
cua tre » cua te, cuu tre, cua triet
vai cua » dai cua, hai cua, lai cua
cac hoc » cach hoc, cac hop, bac hoc
qua cac » cua cac
tay hoi » tay ho, tao hoi, tay thai
anh tay » canh tay, anh ta, anh hay
sac ky » cac ky, sai ky
ky anh » ky danh, ly anh, ty anh
tu sac » tu sach, tu cac, tu san

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 anh tay hoi. hieu qua cac hoc ((((ban hanh) or (van hanh))) or (dia danh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky anh tay hoi. hieu qua cac hoc ((((ban hanh) OR (van hanh))) OR (dia danh)) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky anh tay hoi. hieu qua cac hoc ((((ban hanh) or (van hanh))) or (dia danh)) vai cua tre*.