Perhaps you should try some spelling variations:
van cham » va cham, van pham, gian cham
van tham » van thanh, van tuan, van tai
van chat » cao chat
toan tai » toan tap, doanh tai, toan ban
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va toan » van toan, bai toan, tap toan
xuc va » duc va, tuc va, luc va
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 hoi. hieu ((((van cham) OR (van tham))) OR (van chat)) xuc va toan tai va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu ((((van cham) OR (van tham))) or (van chat)) xuc va toan tai va thiet~".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu ((((van cham) OR (van tham))) or (van chat)) xuc va toan tai va thiet*.