Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van thanh » ban thanh, van tuan
van hanh » ban hanh, van anh, van ban
lang van » dang van, tang van, hoang van
cac duc » cac du, cao duc, cac dac
tuc dan » thuc dan, thuc day, tung dan
lang xa » lang ha, dang xay
hieu va » lieu va, hieu qua
dan ky » van ky
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tuc dan ky ((lang xa) OR (lang van)) hoi. hieu va cac duc ((van hanh) OR (van thanh)) vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tuc dan ky ((lang xa) or (lang van)) hoi. hieu va cac duc ((van hanh) OR (van thanh)) vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: tuc dan ky ((lang xa) or (lang van)) hoi. hieu va cac duc ((van hanh) OR (van thanh)) vi cua triet*.