Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cau tren » cu tren, dau tren, ca tren
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
va cham » va chat, va tham
soc van » hoc van, oc van, sac van
hanh va » hang va, hanh vi
va cau » van cau, va cac, va dau

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