Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dang xay » dang van, van xay
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
lang van » dang van, tang van, hoang van
vu kham » vu khanh
vai cua » dai cua, hai cua, lai cua
duc van » duc va, duc tan, duc manh
su dong » su dung, tu dong, su dang
dong ky » duong ky, hong ky, dong y
vu cham » va cham, tu cham, qua cham

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

• Performing a fuzzy search may retrieve terms with similar spellings: su dong ky ((dang xay) or (lang van)) hoi. hieu ((vu cham) OR (vu kham)) duc van hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su dong ky ((dang xay) OR (lang van)) hoi. hieu ((vu cham) OR (vu kham)) duc van hanh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su dong ky ((dang xay) or (lang van)) hoi. hieu ((vu cham) OR (vu kham)) duc van hanh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: su dong ky ((dang xay) or (lang van)) hoi. hieu ((vu cham) OR (vu kham)) duc van hanh vai cua triet*.