Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van nang » van quang, van ban, van dong
chat luc » chat xuc, chat lua, nhan luc
cau tren » cu tren, dau tren, ca tren
va chat » van chat, va phat, cao chat
va hanh » van hanh, va thanh, va danh
v nang » va nang, vu nang, voi nang
luc va » duc va, tuc va, loc va
vi cau » va cau, ve cau, di cau
o hoi » co hoi, o hoc, o hai

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 ((v nang) or (van nang)) o hoi. lieu va chat luc va hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((v nang) OR (van nang)) o hoi. lieu va chat luc va hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ((v nang) or (van nang)) o hoi. lieu va chat luc va hanh vi cau tren*.