Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh doi » thanh loi, thanh moi, thanh do
thanh di » thanh de, thanh do, thanh dinh
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
cua van » cua ban, cua vat, cua dan
va hoc » van hoc
cua te » cua tu
x hoi » o hoi, x ho, 5 hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ty xang ((x hoi) or (xa hoi)). hieu va hoc cua van ((thanh di) or (thanh doi)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty xang ((x hoi) OR (xa hoi)). hieu va hoc cua van ((thanh di) OR (thanh doi)) cua te.
• Adding a wildcard symbol may retrieve word variants: thuat sach ty xang ((x hoi) or (xa hoi)). hieu va hoc cua van ((thanh di) or (thanh doi)) cua te*.