Perhaps you should try some spelling variations:
sach tham » sach nha
manh hanh » xanh hanh, danh thanh, minh thanh
sach thu » sach thue, sach thieu, cach thuc
cao suc » cao su, cao duc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, xach tay
ve cao » va cao, ve bao, ve cac
vi cua » vai cua, di cua
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ty) or (((sach thu) or (sach tham)))) nang o hoi. hieu ve cao suc manh hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (((sach thu) OR (sach tham)))) nang o hoi. hieu ve cao suc manh hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (((sach thu) or (sach tham)))) nang o hoi. hieu ve cao suc manh hanh vi cua tre*.