Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
ve cam » ve cac, va cam, ve cai
ma hoi » mai hoi, xa hoi, ma hoa
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky sang ma hoi. hieu ((ve cam) or (ve cham)) xuc ((va hanh) or (va dau)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang ma hoi. hieu ((ve cam) OR (ve cham)) xuc ((va hanh) OR (va dau)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ma hoi. hieu ((ve cam) or (ve cham)) xuc ((va hanh) or (va dau)) dai cua tre*.