Perhaps you should try some spelling variations:
nhan tai » hang tai, van tai, toan tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
xuc van » duc van, vuc van, xuc ban
luc van » luoc van, luu van, duc van
tai va » thai va, mai va, tri va
thiet » thieu

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: su sach ky ((nang xa) OR (nang x)) hoi. hieu ve cham ((xuc van) OR (luc van)) nhan tai va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) OR (nang x)) hoi. hieu ve cham ((xuc van) or (luc van)) nhan tai va thiet~".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) OR (nang x)) hoi. hieu ve cham ((xuc van) or (luc van)) nhan tai va thiet*.