Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
mang xa » lang xa, mang may, mang cua
hieu va » lieu va, hieu qua
va cham » va chat, va tham
cham so » cham soc, cham o, ham so
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
di cua » dai cua, doi cua, de cua
cua te » cua tu
so va » so van, so vat, su va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((mang xa) or (dang xay)) hoi. hieu va cham so va hang di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((mang xa) OR (dang xay)) hoi. hieu va cham so va hang di cua te.
• Adding a wildcard symbol may retrieve word variants: thu sach y ((mang xa) or (dang xay)) hoi. hieu va cham so va hang di cua te*.