Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
pham cuc » pham chuc, pham duc, pham cua
vai cua » dai cua, hai cua, lai cua
cuc ban » cua ban, cac ban, cuu ban
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach kem
lang ha » long ha
dang ha » dong ha, dung ha, tang ha
sach ty » sach y, sach tu, sach thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (sach ty)) ((dang ha) OR (lang ha)) hoi. hieu ve pham cuc ban hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) ((dang ha) OR (lang ha)) hoi. hieu ve pham cuc ban hanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach ty)) ((dang ha) OR (lang ha)) hoi. hieu ve pham cuc ban hanh vai cua tre*".