Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dang xay » dang van, van xay
hac truc » hoc truc, hang truc, sach truc
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, hieu ve
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
truc va » thuc va, thuc vat, trung va
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: thu sach ky ((nang xa) or (dang xay)) hoi. ((hieu van) OR (lieu va)) hac truc va hanh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (dang xay)) hoi. ((hieu van) OR (lieu va)) hac truc va hanh va cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) or (dang xay)) hoi. ((hieu van) OR (lieu va)) hac truc va hanh va cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) or (dang xay)) hoi. ((hieu van) OR (lieu va)) hac truc va hanh va cua triet*.