Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
su sach » so sach, vu sach
van hac » van hoc, van ha, van hai
vai cua » dai cua, hai cua, lai cua
van dau » van dao, phan dau
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa

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 ((nang xa) OR (nang x)) hoi. hieu ((van dau) or (van hac)) thuc dan hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (nang x)) hoi. hieu ((van dau) OR (van hac)) thuc dan hanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) OR (nang x)) hoi. hieu ((van dau) or (van hac)) thuc dan hanh vai cua tre*".