Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh doi » thanh doi, hanh noi, hang doi
phat xuc » chat xuc, phat xuat, phap xu
dang xay » dang van, van xay
doi cua » dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
nang xa » lang xa, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y ((((nang xa) or (nang x))) or (dang xay)) hoi. hieu va phat xuc va hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((((nang xa) OR (nang x))) OR (dang xay)) hoi. hieu va phat xuc va hanh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y ((((nang xa) or (nang x))) or (dang xay)) hoi. hieu va phat xuc va hanh doi cua tre*.