Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thai tuc » thai thuc, thai thuy, thai hoc
cau tren » cu tren, dau tren, ca tren
va thai » van thai, va tai, va tham
va hanh » van hanh, va thanh, va danh
y nang » ly nang, v nang, may nang
tuc va » thuc va, truc va, tuc xa
vi cau » va cau, ve cau, di cau

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