Perhaps you should try some spelling variations:
van pham » san pham, van phan, van phat
nhan tai » hang tai, van tai, toan tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va cham » va chat, va tham
va nhan » van nhan, ca nhan, va phan
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: tu sach ky nang xa hoi. hieu ((van pham) or (va cham)) xuc va nhan tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((van pham) OR (va cham)) xuc va nhan tai va thiet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((van pham) or (va cham)) xuc va nhan tai va thiet*.