Perhaps you should try some spelling variations:
tinh van » trinh van, dinh van, tinh va
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va tinh » may tinh
cam loc » cam lo
van cua » vang cua, ban cua, dan cua
hieu ve » hieu van
lai hoi » dai hoi, lai hoa, lai roi
y sang » duy sang
loc va » hoc va, luc va
_ sang » _ san

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 ((y sang) OR (_ sang)) lai hoi. ((hieu ve) or (hieu va)) cam loc va tinh van cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y sang) OR (_ sang)) lai hoi. ((hieu ve) OR (hieu va)) cam loc va tinh van cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y sang) OR (_ sang)) lai hoi. ((hieu ve) or (hieu va)) cam loc va tinh van cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y sang) OR (_ sang)) lai hoi. ((hieu ve) or (hieu va)) cam loc va tinh van cua vat*.