Perhaps you should try some spelling variations:
chua triet » cua triet, chua thiet, chua trieu
thac toc » cac toc, thac cac
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
thi toc » thi tac, thi goc, thi loc
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
va chua » vua chua, ca chua, va chu
tu sach » thu sach, su sach, te sach

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (dang xay)) hoi. hieu van ((thac toc) OR (thi toc)) va hanh va chua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (dang xay)) hoi. hieu van ((thac toc) OR (thi toc)) va hanh va chua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (dang xay)) hoi. hieu van ((thac toc) OR (thi toc)) va hanh va chua triet*.