Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham luc » cham soc, nhan luc, cham cuu
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
va danh » va dinh, va dan, va hanh
luc va » duc va, tuc va, loc va
lai va » loai va, mai va, hai va
dai va » mai 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 van cham luc va danh ((lai va) OR (dai va)) thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty mang may hoi. hieu van cham luc va danh ((lai va) OR (dai va)) thiet".
• Adding a wildcard symbol may retrieve word variants: vu sach ty mang may hoi. hieu van cham luc va danh ((lai va) OR (dai va)) thiet*.