Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
long ha » dong ha, cong ha, dong hoa
tang ma » mang may, tang van
cua tre » cua te, cuu tre, cua triet

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 y ((long ha) or (((tang ma) or (nang cao)))) hoi. hieu va cac duc van hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((long ha) OR (((tang ma) OR (nang cao)))) hoi. hieu va cac duc van hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y ((long ha) or (((tang ma) or (nang cao)))) hoi. hieu va cac duc van hanh vai cua tre*.