Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh hai
va thanh » gia thanh, ban thanh, va tinh
va triet » va thiet, va trien, ve triet
dang xay » dang van, van xay
sach ky » sac ky, sach y, sach ty
van cam » van nam, van cau, van dam
van lam » van nam
nang xa » nang x, lang xa, nang ma
tu sach » thu sach, su sach, te sach
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((nang xa) or (dang xay)) hoi. thien ((van cam) OR (van lam)) xuc va thanh hoi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (dang xay)) hoi. thien ((van cam) OR (van lam)) xuc va thanh hoi va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (dang xay)) hoi. thien ((van cam) OR (van lam)) xuc va thanh hoi va triet*".