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
hieu van » hieu va, thien van, lieu va
van nhan » van phan, van thanh, danh nhan
nhan duc » nhan duoc, nhan luc, phan duc
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
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 van nhan duc va hanh 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 van nhan duc va hanh va cua triet.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang xa) or (dang xay)) hoi. hieu van nhan duc va hanh va cua triet*.