Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
nang co » nang cao, nang doc, nang noi
ve cham » va cham, vu cham, ve chim
ve chat » va chat, van chat
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
va cau » van cau, va cac, va 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 cham) OR (ve chat)) luc ((va hanh) or (va danh)) va cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang co hoc. hieu ((ve cham) OR (ve chat)) luc ((va hanh) OR (va danh)) va cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang co hoc. hieu ((ve cham) OR (ve chat)) luc ((va hanh) or (va danh)) va cau tren".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang co hoc. hieu ((ve cham) OR (ve chat)) luc ((va hanh) or (va danh)) va cau tren*.