Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua triet » cua viet, su triet, va triet
dang xay » dang van, van xay
thac toc » cac toc, thac cac, thi toc
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va thac » van thac, va thuc, va tac
va hang » van hang, va nang, va lang
toc va » hoc va, toc ta, tuc va
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky ((nang xa) or (dang xay)) hoi. hieu va thac toc va hang va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang xa) OR (dang xay)) hoi. hieu va thac toc va hang va cua triet.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang xa) or (dang xay)) hoi. hieu va thac toc va hang va cua triet*.