Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
thien nang » thien bang, thien dang, trien nang
ban thanh » ban hanh, ban hang
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
dau tuc » dau tu, dao tuc, cau truc
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
va dau » va dao
x hoi » xa hoi, o hoi, x ho

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 thien nang x hoi. lieu va dau tuc ((van hanh) or (ban thanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thien nang x hoi. lieu va dau tuc ((van hanh) OR (ban thanh)) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach thien nang x hoi. lieu va dau tuc ((van hanh) or (ban thanh)) vai cua tre*.