Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
van pham » san pham, van phan, van phat
tan hanh » tan thanh, tang hanh, toan hanh
su sach » so sach, vu sach
nang xa » lang xa, nang ma, ang xa
mang xa » lang xa, mang may, dang xay
thi van » thi lan, thi hanh, thi nang
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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 thu ((((nang xa) or (mang xa))) or (nang x)) hoi. thi van pham duc tan hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu ((((nang xa) OR (mang xa))) OR (nang x)) hoi. thi van pham duc tan hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach thu ((((nang xa) or (mang xa))) or (nang x)) hoi. thi van pham duc tan hanh va cua tre*.