Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
duc manh » suc manh, duc anh, duc minh
sach thu » sach thue, sach thieu, sach tham
cua tre » cua te, cua triet, dua tren
hanh va » hang va, hanh vi
cac duc » cac du, cao duc, cac dac
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cuu tre » cau tren, cau treo
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: thu ((sach ky) or (sach thu)) nang x hoi. hieu va cac duc manh hanh va ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach thu)) nang x hoi. hieu va cac duc manh hanh va ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sach thu)) nang x hoi. hieu va cac duc manh hanh va ((cua tre) OR (cuu tre))*".