Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
cam luc » cam xuc
vu sach » vu bach, su sach, vu khach
lang xa » dang xay, lang van
lang ha » long ha
vi va » vi van, vai va, vu va

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: vu sach y ((lang xa) OR (lang ha)) hoi. hieu qua ((cam luc) OR (cau luc)) va hanh vi va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y ((lang xa) OR (lang ha)) hoi. hieu qua ((cam luc) or (cau luc)) va hanh vi va triet~".
• Adding a wildcard symbol may retrieve word variants: vu sach y ((lang xa) OR (lang ha)) hoi. hieu qua ((cam luc) or (cau luc)) va hanh vi va triet*.