Perhaps you should try some spelling variations:
duc manh » suc manh, duc anh, duc minh
te sach » toc sach
hanh ve » hanh vi, hanh va, hanh kem
xuc ban » duc ban, cuc ban, quoc ban
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
cua tre » cua te, cuu tre, cua triet
ve cua » le cua, de cua, te cua

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 ((ky tang) OR (ky dang)) hoa hoc. hieu ve cham ((xuc ban) or (duc manh)) hanh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky tang) OR (ky dang)) hoa hoc. hieu ve cham ((xuc ban) OR (duc manh)) hanh ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky tang) OR (ky dang)) hoa hoc. hieu ve cham ((xuc ban) or (duc manh)) hanh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky tang) OR (ky dang)) hoa hoc. hieu ve cham ((xuc ban) or (duc manh)) hanh ve cua tre*.