Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
van hanh » van thanh, ban hanh, van anh
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, tay hoi, mai hoi
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » va thanh, va danh, ban hanh
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. hieu ve cham luc ((va hanh) OR (van hanh)) lai va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty mang may hoi. hieu ve cham luc ((va hanh) OR (van hanh)) lai va thiet".
• Adding a wildcard symbol may retrieve word variants: vu sach ty mang may hoi. hieu ve cham luc ((va hanh) OR (van hanh)) lai va thiet*.