Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
nang noi » nang doc
cau tren » cu tren, dau tren, ca tren
hoc sach » hoc sinh, hoc cac, hoc anh
noi hoi » noi doi, doi hoi, hoi hoi
va hanh » van hanh, va thanh, va danh
ve cac » vien cac
xuc va » duc va, tuc va, luc va
vi cau » va cau, ve cau, di cau

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (hoc sach)) ky nang noi hoi. hieu ((ve cac) OR (va cac)) xuc va hanh vi cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) OR (hoc sach)) ky nang noi hoi. hieu ((ve cac) or (va cac)) xuc va hanh vi cau tren~".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) OR (hoc sach)) ky nang noi hoi. hieu ((ve cac) or (va cac)) xuc va hanh vi cau tren*.