Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
tham soc » cham soc, tham nuoc, thai son
cau tren » cu tren, dau tren, ca tren
nang xa » nang x, nang ma, mang xa
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
soc van » hoc van, oc van, sac van
lang xa » lang ha, dang xay, lang van
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) or (nuoc sach)) ty ((nang xa) or (lang xa)) hoi. hieu va tham soc van hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (nuoc sach)) ty ((nang xa) OR (lang xa)) hoi. hieu va tham soc van hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (nuoc sach)) ty ((nang xa) or (lang xa)) hoi. hieu va tham soc van hanh vi cau tren*.