Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van tham » van thanh, van tuan, van tai
hang tai » hang va, dung tai
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va hang » van hang, va nang, va lang
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.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. hieu ((van tham) or (((van chat) or (cao chat)))) xuc va hang tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu ((van tham) OR (((van chat) OR (cao chat)))) xuc va hang tai va thiet.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu ((van tham) or (((van chat) or (cao chat)))) xuc va hang tai va thiet*.