Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
khai tuc » thai tuc, khai thac, khai tuan
dang xay » dang van, van xay
va hanh » va thanh, va danh, ban hanh
va khai » van khai, va khao, va kha
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((nang xa) or (dang xay)) hoi. hieu va khai tuc ((va hanh) OR (van hanh)) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (dang xay)) hoi. hieu va khai tuc ((va hanh) OR (van hanh)) vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) or (dang xay)) hoi. hieu va khai tuc ((va hanh) OR (van hanh)) vi cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (dang xay)) hoi. hieu va khai tuc ((va hanh) OR (van hanh)) vi cua triet*.