Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dau tren » dau tien, dat tren, dau tieng
sach ky » sac ky, sach y, sach ty
nang co » nang cao, nang doc, nang noi
ve chim » va chim, ve cham, ve chinh
vu cham » va cham, vu kham, tu cham
hanh ve » hanh vi, hanh va, hanh kem
xuc va » tuc va, luc va, xac va
ve dau » va dau, ve du, ke dau

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 nang co hoc. hieu ((ve chim) or (vu cham)) ((xuc va) OR (duc va)) hanh ve dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang co hoc. hieu ((ve chim) OR (vu cham)) ((xuc va) OR (duc va)) hanh ve dau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang co hoc. hieu ((ve chim) or (vu cham)) ((xuc va) OR (duc va)) hanh ve dau tren*".