Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
hoc sach » hoc sinh, hoc cac, hoc anh
nang mai » nang ma, nang tai, lang mai
lua tren » dua tren, la tren, quan tren
mai hoi » mai khoi, dai hoi, lai hoi
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
va cam » va cham, va cao, va cai
luc va » duc va, tuc va, loc va
vi lua » vi luu

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)) y nang mai hoi. lieu ((va cam) OR (va cac)) luc va hanh vi lua tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) OR (hoc sach)) y nang mai hoi. lieu ((va cam) or (va cac)) luc va hanh vi lua tren~".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) OR (hoc sach)) y nang mai hoi. lieu ((va cam) or (va cac)) luc va hanh vi lua tren*.