Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu san » hieu van, hieu sau, chieu sang
nam thuc » nam thuoc, am thuc, nam thu
vat hanh » vat thanh, van hanh, va hanh
tu cach » tu cac
nang xa » nang x, lang xa, nang ma
san nam » van nam, dan nam, san dam
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (hoc sach)) ky nang xa hoi. hieu san nam thuc vat hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (hoc sach)) ky nang xa hoi. hieu san nam thuc vat hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (hoc sach)) ky nang xa hoi. hieu san nam thuc vat hanh vi cua tre*.