Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
cham duc » pham duc, pham duy, phan duc
lang van » dang van, tang van, hoang van
dong ky » duong ky, hong ky, dong y
lang xa » lang ha, dang xay
hieu vu » hieu va, hieu ve, hieu su
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 dong ky ((lang xa) OR (lang van)) hoi. hieu vu ((cham duc) OR (cham soc)) ban hanh vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu dong ky ((lang xa) OR (lang van)) hoi. hieu vu ((cham duc) OR (cham soc)) ban hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: tu dong ky ((lang xa) OR (lang van)) hoi. hieu vu ((cham duc) OR (cham soc)) ban hanh vi cua triet*.