Perhaps you should try some spelling variations:
duc manh » suc manh, duc anh, duc minh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hanh ve » hanh vi, hanh va, hanh kem
hanh de » hanh kem
cua tre » cua te, cuu tre, cua triet
xuc ban » duc ban, cuc ban, quoc ban
hieu ve » hieu va, hieu van
tang ha » lang ha, tang ma, trung ha
ky tang » ky nang, ky dang, kho tang
ve cam » ve cham, ve cac, va cam
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky tang ha hoi. hieu ve cam ((xuc ban) or (duc manh)) ((hanh de) OR (hanh ve)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang ha hoi. hieu ve cam ((xuc ban) OR (duc manh)) ((hanh de) OR (hanh ve)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky tang ha hoi. hieu ve cam ((xuc ban) or (duc manh)) ((hanh de) OR (hanh ve)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang ha hoi. hieu ve cam ((xuc ban) or (duc manh)) ((hanh de) OR (hanh ve)) cua tre*.