Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
va cham » va chat, va tham
sach ky » sac ky, sach y, sach ty
vu kham » vu khanh
nang ma » tang ma, sang ma, mang may
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
va don » va dong, va doc, va do
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 ma) or (nang cao)) hoi. hieu ((vu kham) or (va cham)) xuc va don vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ma) OR (nang cao)) hoi. hieu ((vu kham) OR (va cham)) xuc va don vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ma) or (nang cao)) hoi. hieu ((vu kham) or (va cham)) xuc va don vi cua tre*.