Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, ang xa
mang xa » mang may, dang xay, mang cua
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
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 sach ky ((((nang xa) or (mang xa))) or (lang xa)) hoi. hieu ve cam duc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((((nang xa) OR (mang xa))) OR (lang xa)) hoi. hieu ve cam duc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((((nang xa) or (mang xa))) or (lang xa)) hoi. hieu ve cam duc va hanh vi cua tre*.