Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
dang xay » dang van, van xay
thanh di » thanh de, thanh do, thanh dinh
cua tre » cua te, cuu tre, cua triet
cac tuc » cac toc, cac tu, cac tac
nang xa » nang x, lang xa, nang ma
tuc va » thuc va, truc va, tuc xa
sac ky » cac ky, sai ky
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((nang xa) or (dang xay)) hoi. lieu va cac tuc va ((thanh di) OR (thanh doi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang xa) OR (dang xay)) hoi. lieu va cac tuc va ((thanh di) OR (thanh doi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((nang xa) or (dang xay)) hoi. lieu va cac tuc va ((thanh di) OR (thanh doi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang xa) or (dang xay)) hoi. lieu va cac tuc va ((thanh di) OR (thanh doi)) cua tre*.