Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
hieu le » hieu ve, hieu he, hieu ly
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ma hoi » xa hoi, ma hoa, me hoi
le dat » le dan, de dat, le dac
vi cua » vai cua, di cua
nuoc » quoc, duoc, ngoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang ((ma hoi) or (mai hoi)). hieu le dat nuoc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ((ma hoi) OR (mai hoi)). hieu le dat nuoc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((ma hoi) or (mai hoi)). hieu le dat nuoc va hanh vi cua tre*.