Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang co » nang cao, nang doc, nang noi
ve cham » ve chat, vu cham, ve chim
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
du tren » dua tren, dau tren, duc tren
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
ve du » ve su, te du, va du

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 y nang co hoc. hieu ((ve cham) or (va cham)) luc va hanh ve du tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang co hoc. hieu ((ve cham) OR (va cham)) luc va hanh ve du tren.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang co hoc. hieu ((ve cham) or (va cham)) luc va hanh ve du tren*.