Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
hanh lai » hanh lam, hanh tai, thanh lap
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
ty mang » ty xang, ty hang, tin mang
may hoi » may thoi, mai hoi, may hmi
tay hoi » tay ho, tao hoi, tay thai
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
luc va » duc va, tuc va, loc va
lai va » loai va, mai va, dai 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: vu sach ty mang ((may hoi) OR (tay hoi)). hieu ve cham luc va hanh lai va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty mang ((may hoi) OR (tay hoi)). hieu ve cham luc va hanh lai va thiet".
• Adding a wildcard symbol may retrieve word variants: vu sach ty mang ((may hoi) OR (tay hoi)). hieu ve cham luc va hanh lai va thiet*.