Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
dang xay » dang van, van xay
so sach » so sanh, bo sach, co sach
va tham » van tham, va thanh, va thuat
va hanh » van hanh, va thanh, va danh
va cham » va chat
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

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 x) or (dang xay)) hoi. hieu ((va cham) OR (va tham)) xuc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((nang x) OR (dang xay)) hoi. hieu ((va cham) OR (va tham)) xuc va hanh dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((nang x) or (dang xay)) hoi. hieu ((va cham) OR (va tham)) xuc va hanh dai cua tre*".