Perhaps you should try some spelling variations:
chat triet » chet triet, phat trien, chat thien
ban thanh » ban hanh, ban hang
thanh le » thinh le, thanh ve, thanh de
le chat » ly chat, le nhat, ve chat
xuc ban » duc ban, cuc ban, quoc ban
sach ty » sach y, sach tu, sach thu
vu sach » vu bach, su sach, vu khach
ty nang » ky nang, ty xang, ty hang
mo hoi » mo phoi, mo hoc, co hoi
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
ro doi » bo doi, co doi, ho doi

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty nang ((ro doi) or (mo hoi)). hieu ((ve cam) or (va cam)) xuc ban thanh le chat triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang ((ro doi) OR (mo hoi)). hieu ((ve cam) OR (va cam)) xuc ban thanh le chat triet.
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang ((ro doi) or (mo hoi)). hieu ((ve cam) or (va cam)) xuc ban thanh le chat triet*.