Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
dau tren » dau tien, dat tren, dau tieng
nang co » nang cao, nang doc, nang noi
tu sach » su sach, te sach, tu cach
ve cham » va cham, ve chat, ve chim
vu cham » va cham, vu kham, tu cham
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
luc va » duc va, tuc va, loc 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) OR (tu sach)) ky nang co hoc. hieu ((ve cham) or (vu cham)) luc va hanh ve dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky nang co hoc. hieu ((ve cham) OR (vu cham)) luc va hanh ve dau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ky nang co hoc. hieu ((ve cham) or (vu cham)) luc va hanh ve dau tren*".