Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
nang ma » tang ma, sang ma, nang cao
va tham » van tham, va thanh, va thuat
va cham » va chat
nang xa » nang x, lang xa, mang xa
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
luc va » duc va, tuc va, loc va
ve cau » ke cau, va cau, ve cac

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: thu sach y ((nang xa) OR (nang ma)) hoi. lieu ((va tham) OR (va cham)) luc va hanh ve cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((nang xa) or (nang ma)) hoi. lieu ((va tham) OR (va cham)) luc va hanh ve cau tren~".
• Adding a wildcard symbol may retrieve word variants: thu sach y ((nang xa) or (nang ma)) hoi. lieu ((va tham) OR (va cham)) luc va hanh ve cau tren*.