Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
bo sach » co sach
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua
va am » va lam, va cam

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

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