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
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
ha truc » ba truc, ha thuc, hang truc
truc va » thuc va, thuc vat, trung va
hanh va » hang va
van ha » van hoa, van chat, van hanh

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 ha truc va ((hanh va) OR (hanh vi)) 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 ha truc va ((hanh va) OR (hanh vi)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky ((nang xa) or (dang xay)) hoi. hieu van ha truc va ((hanh va) OR (hanh vi)) cua triet".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang xa) or (dang xay)) hoi. hieu van ha truc va ((hanh va) OR (hanh vi)) cua triet*.