Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
sach tham » sach nha
sach thu » sach thue, sach thieu, cach thuc
cam suc » cam xuc, cao suc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach thu) OR (sach tham)) nang xa hoi. hieu ve ((cam suc) or (cham soc)) manh hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach thu) OR (sach tham)) nang xa hoi. hieu ve ((cam suc) OR (cham soc)) manh hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach thu) OR (sach tham)) nang xa hoi. hieu ve ((cam suc) or (cham soc)) manh hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach thu) OR (sach tham)) nang xa hoi. hieu ve ((cam suc) or (cham soc)) manh hanh vi cua tre*.