Perhaps you should try some spelling variations:
van cham » van chat, va cham, van pham
van tham » van thanh, van tuan, van chat
va thieu » va thiet, va hieu, va tieu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van tai » von tai, van tuan
xuc va » duc va, tuc va, luc va
tai va » thai va, mai va, tri va

You may be able to get more results by adjusting your search query.

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