Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh de, thanh do
va thanh » gia thanh, ban thanh, va tinh
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
hieu le » hieu ve, hieu he, hieu ly
tang ma » mang may, tang van
sang ma » nang ma, sang tao, mang may
va thu » va thuc, van thu, va tu
di cua » dai cua, doi cua, de cua

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 ((tang ma) or (sang ma)) hoi. hieu le ((ma thu) or (va thu)) va thanh di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty ((tang ma) OR (sang ma)) hoi. hieu le ((ma thu) OR (va thu)) va thanh di cua vat.
• Adding a wildcard symbol may retrieve word variants: vu sach ty ((tang ma) or (sang ma)) hoi. hieu le ((ma thu) or (va thu)) va thanh di cua vat*.