Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
dang xay » dang van, van xay
va thanh » gia thanh, ban thanh, va tinh
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
su tien » su kien, su hien, tu tieng
cac tu » cac thu, cach tu, cac du
doi su » oi su, don su, voi su

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y ((nang xa) or (dang xay)) hoi. hieu va cac tu va thanh doi su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang xa) OR (dang xay)) hoi. hieu va cac tu va thanh doi su tien.
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang xa) or (dang xay)) hoi. hieu va cac tu va thanh doi su tien*.