Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
ban thanh » ban hanh, ban hang
cham luc » nhan luc, cham cuu, chat lua
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
ty sang » ty xang, ty hang, duy sang
van cua » vang cua, ban cua, dan cua
ma hoi » mai hoi, ma hoa, me hoi

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 sang ((ma hoi) or (xa hoi)). hieu va ((cham luc) OR (cham soc)) ban thanh van cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty sang ((ma hoi) OR (xa hoi)). hieu va ((cham luc) OR (cham soc)) ban thanh van cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty sang ((ma hoi) or (xa hoi)). hieu va ((cham luc) OR (cham soc)) ban thanh van cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sach ty sang ((ma hoi) or (xa hoi)). hieu va ((cham luc) OR (cham soc)) ban thanh van cua vat*.