Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
cac loc » cac lop, cac toc, cac hoc
van cac » van hac, van cau, van bac
sach tu » sach thu, cach tu, sach ty
lang xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet
loc va » hoc va, luc va
di cua » dai cua, doi cua, de cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu ((nang x) OR (((lang xa) OR (dang xay)))) hoi. hieu van cac loc va hanh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tu ((nang x) or (((lang xa) OR (dang xay)))) hoi. hieu van cac loc va hanh di cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach tu ((nang x) or (((lang xa) OR (dang xay)))) hoi. hieu van cac loc va hanh di cua tre*.