Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
cau tren » cu tren, dau tren, ca tren
co sach » bo sach, cuon sach, hoc sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va danh, ban hanh
va cam » va cham, va cac, va cao
va cau » van cau, va cac, va dau
x hoi » o hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ky nang ((x hoi) or (xa hoi)). lieu va cam xuc ((va hanh) OR (va thanh)) va cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ky nang ((x hoi) OR (xa hoi)). lieu va cam xuc ((va hanh) OR (va thanh)) va cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky nang ((x hoi) or (xa hoi)). lieu va cam xuc ((va hanh) OR (va thanh)) va cau tren".
• Adding a wildcard symbol may retrieve word variants: co sach ky nang ((x hoi) or (xa hoi)). lieu va cam xuc ((va hanh) OR (va thanh)) va cau tren*.