Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
va thanh » gia thanh, va tinh, le thanh
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
mang xa » lang xa, mang may, dang xay
de cua » le cua, te cua, dieu cua
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((mang xa) or (nang x)) hoi. hieu va cam tuc ((va thanh) OR (ban thanh)) de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((mang xa) OR (nang x)) hoi. hieu va cam tuc ((va thanh) OR (ban thanh)) de cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((mang xa) or (nang x)) hoi. hieu va cam tuc ((va thanh) OR (ban thanh)) de cua tre*".