Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va hanh » van hanh, va thanh, va danh
vien da » vien dai, hien dai
sach ky » sac ky, sach y, sach ty
va tham » van tham, va cham, va thanh
tang ma » tang van
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
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: thu sach ky ((tang ma) OR (mang may)) hoi. hieu ((va tham) or (vien da)) tuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((tang ma) OR (mang may)) hoi. hieu ((va tham) OR (vien da)) tuc va hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((tang ma) OR (mang may)) hoi. hieu ((va tham) or (vien da)) tuc va hanh vi cua tre*".