Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cham tuc » nham thuc, pham thuc, tham thuc
va thanh » gia thanh, ban thanh, va tinh
va cham » va chat, va tham
va hanh » van hanh, va danh, ban hanh
cu tren » tu tren, dua tren
y nang » ly nang, v nang, may nang
di cu » di cau, di cua, di du

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

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