Perhaps you should try some spelling variations:
van pham » san pham, van phan, van phat
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va cham » va chat, va tham
han tai » hang tai, nhan tai, van tai
nang o » nang co, nang ho, nang ro
xuc va » duc va, tuc va, luc va
va han » va phan, van han, va hanh
tai va » thai va, mai va, tri va
o hoi » co hoi, o hoc, o hai
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 ty nang o hoi. hieu ((van pham) or (va cham)) xuc va han tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang o hoi. hieu ((van pham) OR (va cham)) xuc va han tai va thiet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang o hoi. hieu ((van pham) or (va cham)) xuc va han tai va thiet*.